Upgrade issue Error 500: Internal Server Error (I am running a a master version)

[VitorFrost]

I got a red flag to upgrade, and then I got this error I am running a a master version Also I need to point out that I needed to manually adjust the date and time. This is recurrent issue to me, If I keep the raspberry off for a long period, It never updates the time and give multiple problems with certificates.

Something bad happened but it's probably not your fault. Letting the developers know about these issues is crucial to supporting Mycodo. Please submit a [new issue on GitHub](https://github.com/kizniche/Mycodo/issues/new?template=problem-bug-report.md) with the following diagnostic information and error traceback (copy the entire traceback):

Version: 8.14.2
Database: 16f4749215ac
Model: Raspberry Pi 4 Model B Rev 1.5

Release:
Distributor ID: Raspbian
Description: Raspbian GNU/Linux 11 (bullseye)
Release: 11
Codename: bullseye

Firmware:
b''

Error (Full Traceback):

Traceback (most recent call last):
  File "/var/mycodo-root/env/lib/python3.9/site-packages/flask/app.py", line 2525, in wsgi_app
    response = self.full_dispatch_request()
  File "/var/mycodo-root/env/lib/python3.9/site-packages/flask/app.py", line 1822, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/var/mycodo-root/env/lib/python3.9/site-packages/flask_restx/api.py", line 675, in error_router
    return original_handler(e)
  File "/var/mycodo-root/env/lib/python3.9/site-packages/flask/app.py", line 1820, in full_dispatch_request
    rv = self.dispatch_request()
  File "/var/mycodo-root/env/lib/python3.9/site-packages/flask/app.py", line 1796, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
  File "/var/mycodo-root/env/lib/python3.9/site-packages/flask_login/utils.py", line 290, in decorated_view
    return current_app.ensure_sync(func)(*args, **kwargs)
  File "/home/pi/Mycodo/mycodo/mycodo_flask/routes_admin.py", line 534, in admin_upgrade
    current_latest_major_version = current_latest_release.split('.')[0]
AttributeError: 'NoneType' object has no attribute 'split'

[kizniche]

Duplicate #1266