jets deploy fails when project is created by job mode

Checklist

[x] Upgrade Jets: Are you using the latest version of Jets? This allows Jets to fix issues fast. There's a jets upgrade command that makes this a simple task. There's also an Upgrading Guide: http://rubyonjets.com/docs/upgrading/
[x] Reproducibility: Are you reporting a bug others will be able to reproduce and not asking a question. If you're unsure or want to ask a question, do so on https://community.rubyonjets.com
[x] Code sample: Have you put together a code sample to reproduce the issue and make it available? Code samples help speed up fixes dramatically. If it's an easily reproducible issue, then code samples are not needed. If you're unsure, please include a code sample.

My Environment

Software	Version
Operating System	OSX 10.14.4
Jets	1.9.6
Ruby	2.5.3

Expected Behaviour

$ jets new tiny-project --mode job
$ cd tiny-project
$ jets deploy

-> The project tiny-project is deployed to the AWS Lambda.

Current Behavior

Failed to deploy with this error message.

$ `require': cannot load such file -- path/to/tiny-project/config/routes.rb (LoadError)

Step-by-step reproduction instructions

-> I already shown it in Expected Behaviour section.

Code Sample

In the PR #264, the file existence check of routes.rb is deleted. https://github.com/tongueroo/jets/pull/264/files#diff-e7ac2e68b9550688c1c55dca13f7fab9L341

But, initializing a project in job mode (jets create tiny-project --mode job), routes.rb is not created.

Creating a new Jets project called tiny-project.
      create  tiny-project
      create  tiny-project/.env.development
      create  tiny-project/.env.test
      create  tiny-project/.env
      create  tiny-project/.gitignore
      create  tiny-project/.jetskeep
      create  tiny-project/Gemfile
      create  tiny-project/README.md
      create  tiny-project/Rakefile
      create  tiny-project/app/jobs/application_job.rb
      create  tiny-project/config/application.rb
      create  tiny-project/config/environments/development.rb
      create  tiny-project/config/environments/production.rb
      create  tiny-project/config/environments/test.rb

Therefore, when I create empty routes.rb or monkey-patch to Jets::Application#load_routes to check existing of routes.rb, deploying the project is succeed.

Solution Suggestion

Creates empty routes.rb when initialize project in job mode.
Check routes.rb existing in Jets::Application#load_routes.

rubyonjets / jets

jets deploy fails when project is created by job mode #270