Add an error code for missing docstring in a package

[Nurdok]

Missing docstring in __init__.py files should be a different error than in a regular module.

[sigmavirus24]

Is it so this can be ignored more easily?

[Nurdok]

Yes. I find that docstring in (mostly empty) __init__.py files are usually ignored, as opposed to regular modules.

[jayvdb]

If this is done, I suggest it should only a different code if the init.py is effectively empty, and preferably without imports. But in that case, why not just exclude the init.py entirely?

[sigmavirus24]

@jayvdb No one is arguing that this should be off by default but that it should just be an entirely separate error.

[jayvdb]

I didnt mention 'default'.

I am suggesting it isnt a separate problem deserving of a separate error code unless the contents of the file are somehow different. a/foo/init.py is not substantially different from a/foo.py unless a/foo/bar.py exists.