Invalid markers silently ignored

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Issue description

When there is a syntax error in the markers in Pipfile, pipenv lock silently ignores it and adds the package without any markers.

Expected result

pipenv should show an error or at least a warning in this case.

Actual result

> pipenv lock --verbose
Locking [dev-packages] dependencies…
Locking [packages] dependencies…
Success!
Using pip: -i https://pypi.org/simple
Using pip: -i https://pypi.org/simple
Using pip: -i https://pypi.org/simple

                          ROUND 1
Current constraints:
  win10toast~=0.9

Finding the best candidates:
  found candidate win10toast==0.9 (constraint was ~=0.9)

Finding secondary dependencies:
  win10toast==0.9           requires pypiwin32, setuptools

New dependencies found in this round:
  adding ['pypiwin32', '', '[]']
Removed dependencies in this round:
Unsafe dependencies in this round:
------------------------------------------------------------
Result of round 1: not stable

                          ROUND 2
Current constraints:
  pypiwin32
  win10toast~=0.9

Finding the best candidates:
  found candidate pypiwin32==223 (constraint was <any>)
  found candidate win10toast==0.9 (constraint was ~=0.9)

Finding secondary dependencies:
  win10toast==0.9           requires pypiwin32, setuptools
  pypiwin32==223            requires pywin32>=223

New dependencies found in this round:
  adding ['pywin32', '>=223', '[]']
Removed dependencies in this round:
Unsafe dependencies in this round:
------------------------------------------------------------
Result of round 2: not stable

                          ROUND 3
Current constraints:
  pypiwin32
  pywin32>=223
  win10toast~=0.9

Finding the best candidates:
  found candidate pypiwin32==223 (constraint was <any>)
  found candidate pywin32==224 (constraint was >=223)
  found candidate win10toast==0.9 (constraint was ~=0.9)

Finding secondary dependencies:
  pypiwin32==223            requires pywin32>=223
  pywin32==224              requires -
  win10toast==0.9           requires pypiwin32, setuptools
------------------------------------------------------------
Result of round 3: stable, done

Updated Pipfile.lock (9c709d)!

Steps to replicate

Provide the steps to replicate (which usually at least includes the commands and the Pipfile).

Create a Pipfile with a syntax error in the markers of a dependency (see below)
Run pipenv lock

$ pipenv --support

Pipenv version: '2018.11.26'

Pipenv location: 'c:\\users\\nyuszika7h\\appdata\\local\\programs\\python\\python37\\lib\\site-packages\\pipenv'

Python location: 'c:\\users\\nyuszika7h\\appdata\\local\\programs\\python\\python37\\python.exe'

Python installations found:

3.7.3: C:\Users\nyuszika7h\AppData\Local\Programs\Python\Python37\python.exe
3.7.1: C:\Users\nyuszika7h\AppData\Local\Programs\Python\Python37-32\python.exe
3.6.8: C:\Users\nyuszika7h\AppData\Local\Programs\Python\Python36\python.exe
2.7: C:\Users\nyuszika7h\AppData\Local\Programs\Python\Python27\python.exe

PEP 508 Information:

{'implementation_name': 'cpython',
 'implementation_version': '3.7.3',
 'os_name': 'nt',
 'platform_machine': 'AMD64',
 'platform_python_implementation': 'CPython',
 'platform_release': '10',
 'platform_system': 'Windows',
 'platform_version': '10.0.17763',
 'python_full_version': '3.7.3',
 'python_version': '3.7',
 'sys_platform': 'win32'}

System environment variables:

ALLUSERSPROFILE
ANDROID_SDK_HOME
APPDATA
ASL.LOG
COMMONPROGRAMFILES
COMMONPROGRAMFILES(X86)
COMMONPROGRAMW6432
COMPUTERNAME
COMSPEC
DRIVERDATA
ESET_OPTIONS
FPS_BROWSER_APP_PROFILE_STRING
FPS_BROWSER_USER_PROFILE_STRING
HOMEDRIVE
HOMEPATH
INTELLIJ IDEA
INTEL_DEV_REDIST
JD2_HOME
LIBTHAI_DICTDIR
LOCALAPPDATA
LOGONSERVER
MIC_LD_LIBRARY_PATH
NUMBER_OF_PROCESSORS
ONEDRIVE
OS
PATH
PATHEXT
PROCESSOR_ARCHITECTURE
PROCESSOR_IDENTIFIER
PROCESSOR_LEVEL
PROCESSOR_REVISION
PROGRAMDATA
PROGRAMFILES
PROGRAMFILES(X86)
PROGRAMW6432
PSMODULEPATH
PT7HOME
PUBLIC
PYCHARM
QT_DEVICE_PIXEL_RATIO
SESSIONNAME
SYSTEMDRIVE
SYSTEMROOT
TEMP
TMP
USERDOMAIN
USERDOMAIN_ROAMINGPROFILE
USERNAME
USERPROFILE
WINDIR
PIP_DISABLE_PIP_VERSION_CHECK
PYTHONDONTWRITEBYTECODE
PIP_SHIMS_BASE_MODULE
PIP_PYTHON_PATH
PYTHONFINDER_IGNORE_UNSUPPORTED

Pipenv?specific environment variables:

Debug?specific environment variables:

PATH: C:\Perl64\site\bin;C:\Perl64\bin;C:\Program Files (x86)\Common Files\Intel\Shared Libraries\redist\intel64\compiler;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\WINDOWS\System32\OpenSSH\;C:\Android;C:\Windows\System32;C:\Program Files\Git\cmd;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Program Files (x86)\WinSCP\;C:\Program Files (x86)\Universal Extractor;C:\Program Files (x86)\Universal Extractor\bin;C:\Users\nyuszika7h\AppData\Local\Programs\Python\Python37\Scripts\;C:\Users\nyuszika7h\AppData\Local\Programs\Python\Python37\;C:\Users\nyuszika7h\AppData\Local\Programs\Python\Python27\Scripts\;C:\Users\nyuszika7h\AppData\Local\Microsoft\WindowsApps;C:\Users\nyuszika7h\Downloads\Apps\aria2;C:\Users\nyuszika7h\Downloads\Apps\FFmpeg\bin;C:\Program Files\MKVToolNix;C:\Users\nyuszika7h\AppData\Local\Programs\Fiddler;C:\Windows;C:\Program Files (x86)\Nmap;C:\Users\nyuszika7h\AppData\Local\Programs\Microsoft VS Code\bin;C:\texlive\2018\bin\win32;C:\Users\nyuszika7h\AppData\Local\Microsoft\WindowsApps;C:\Program Files\GPAC;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Users\nyuszika7h\Downloads\Apps;C:\Program Files\JetBrains\IntelliJ IDEA 2018.3.4\bin;C:\Program Files\JetBrains\PyCharm 2018.3.4\bin;C:\Program Files (x86)\Nmap;C:\Program Files (x86)\Nmap;c:\users\nyuszika7h\appdata\local\programs\python\python37\lib\site-packages\pywin32_system32

Contents of Pipfile ('F:\Temp\SampleProject\Pipfile'):

[[source]]
name = "pypi"
url = "https://pypi.org/simple"
verify_ssl = true

[dev-packages]

[packages]
win10toast = {version = "~=0.9", markers="sys_platform == 'win32"}

Contents of Pipfile.lock ('F:\Temp\SampleProject\Pipfile.lock'):

{
    "_meta": {
        "hash": {
            "sha256": "acbe26daf47885cc302a19647f5fa08a820ca16c5367016cc05271d4129c709d"
        },
        "pipfile-spec": 6,
        "requires": {},
        "sources": [
            {
                "name": "pypi",
                "url": "https://pypi.org/simple",
                "verify_ssl": true
            }
        ]
    },
    "default": {
        "pypiwin32": {
            "hashes": [
                "sha256:67adf399debc1d5d14dffc1ab5acacb800da569754fafdc576b2a039485aa775",
                "sha256:71be40c1fbd28594214ecaecb58e7aa8b708eabfa0125c8a109ebd51edbd776a"
            ],
            "version": "==223"
        },
        "pywin32": {
            "hashes": [
                "sha256:22e218832a54ed206452c8f3ca9eff07ef327f8e597569a4c2828be5eaa09a77",
                "sha256:32b37abafbfeddb0fe718008d6aada5a71efa2874f068bee1f9e703983dcc49a",
                "sha256:35451edb44162d2f603b5b18bd427bc88fcbc74849eaa7a7e7cfe0f507e5c0c8",
                "sha256:4eda2e1e50faa706ff8226195b84fbcbd542b08c842a9b15e303589f85bfb41c",
                "sha256:5f265d72588806e134c8e1ede8561739071626ea4cc25c12d526aa7b82416ae5",
                "sha256:6852ceac5fdd7a146b570655c37d9eacd520ed1eaeec051ff41c6fc94243d8bf",
                "sha256:6dbc4219fe45ece6a0cc6baafe0105604fdee551b5e876dc475d3955b77190ec",
                "sha256:9bd07746ce7f2198021a9fa187fa80df7b221ec5e4c234ab6f00ea355a3baf99"
            ],
            "version": "==224"
        },
        "win10toast": {
            "hashes": [
                "sha256:44e5afa1001de88a0ee533872231521fa67c7d144f39974089af242d9c4620a4"
            ],
            "index": "pypi",
            "version": "==0.9"
        }
    },
    "develop": {}
}

pypa / pipenv