Improve Empty if/elseif statement filter

[looterz]

Would be great if this filter didn't trigger when comments are within the statement, often time's I see or have commented out code in conditionals for debugging or marking areas I need to implement something later. In a large project where these TODOs exist, it can plug up the lint log with lots of non-issues.

[FPtje]

There are several problems I have with this, one technical and one conceptually:

Technically, comments are only stored with a position. To figure out whether a comment "belongs to" an if statement, I'd have to look through all the comments and check whether the position is between the if and end of the if-statement I'm about to give a warning about for being empty.

Secondly, empty if-statements are dead code containing a potentially expensive condition expression. Regardless of whether they contain a comment or not, they are redundant. If you never fill in the -- TODO, you keep the empty if-statement, which is well worth a warning. It would be better to comment out the entire if-statement.

Because of that I don't think any time should be spent on implementing this. An if statement is empty too when contains only comments.