Remove empty lines after rewrite

[koppor]

• Fixes JavaDoc: RemoveJavaDocAuthorTag and RemoveEmptyJavaDocParameters should remove empty JavaDoc after cleanup #119
• Fixes RemoveEmptyJavaDocParameters should remove "empty" lines #98

Checklist

• I've added unit tests to cover both positive and negative cases
• I've read and applied the recipe conventions and best practices
• I've used the IntelliJ IDEA auto-formatter on affected files

[koppor]

I left all commits, because there will be a squash-merge, won't it?

[koppor]

I did not see #190 while implementing. Think, my code is shorter then the one suggested at #190.

[timtebeek]

Thanks a lot for taking this on! #190 had indeed lingered as there were a lot of formatting changes, making it a challenge to review. That earlier PR did have explicit tests for @throws and @return, which seem to have been removed here. Should any of that make it in here?

I'm inclined to proceed with this PR, as I like the minimal approach you took at making changes, such that it's easier to spot what goes into removing empty lines. Let's get the comments resolved and get this fix in.