Ignore all blocks with comments in EmptyBlock #398
                
     Merged
            
            
          
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Fixes #221.
I considered updating EmptyRoutine and SwallowedException to also ignore all blocks with comments, but I didn't in the end because I decided they had higher-level reasoning than just syntax-level "this block is unnecessary", and so we probably want to forbid those bad patterns regardless of whether there's a comment or not. Happy to hear other views.