Add checker for empty comments

[orSolocate]

Steps

• Add yourself to CONTRIBUTORS if you are a new contributor.
• Add a ChangeLog entry.
• If it's a new feature or an important bug fix, add a What's New entry in doc/whatsnew/.
• Write a good description on what the PR does.

Description

Added comment_ending plug-in for empty comments.

• Empty comments in your code can be confusing in large scale programs, especially when developers are replaced frequently. If a developer who didn't write the code see an empty comment s/he can think there is a missing a comment. I know that some developers put empty comments when they want to bookmark somewhere in the code, and this is a bad practice that should be avoided.
• This checker recognizes lines with empty comments, but also accurate enough not to raise False Positives (or else people would stop using this tool).
• Since a message is raised only with empty comments, I could not add a test at tests/test_functional.py folder, so I wrote a unittest instead.

Type of Changes

IsDone	Type
	🐛 Bug fix
✓	✨ New feature
	🔨 Refactoring
	📜 Docs

Related Issue

None

[coveralls]

Coverage increased (+0.01%) to 90.723% when pulling d66cd83 on orSolocate:orb_branch into 98d2c06 on PyCQA:master.

[Pierre-Sassoulas]

Thank you for the check, and yes evidently we can't do functional tests for this one.

I made some suggestion that might not be in the spirit of the original checker. I think there is also empty comments created voluntarily to separate code part. I think it's actually better to create function/class/file/package, if you feel the need to separate different part of the code with empty comment. Your checker seems to be a way to check for this almost similar use case at the same time. Let me know what you think.

[Pierre-Sassoulas]

Thank for the new checker :) Could you rebase on the latest master, please ?

[orSolocate]

@Pierre-Sassoulas I fetched the remote master and merged my branch into it. then uploaded my branch here. I wasn't sure if that is what you wanted me to do, or you wanted me to push the Master also?

[Pierre-Sassoulas]

Thank you, could you rebase on it instead of merging, please ?

[orSolocate]

@Pierre-Sassoulas I think it is fixed now.

[orSolocate]

I pushed again to get rid of an extra commit. There is only 1 commit for my checker now with all the fixes :)

[Pierre-Sassoulas]

Thank you for the rebase and congratulation on the new checker 👍