Steps to reproduce.

• Go to https://secure.phabricator.com/rP219357aa9fa30c1f1a71ee0b36440b077d37852b
• Click on the first comment -> Quote Comment.

Observe that the quoted text refers to a null when it should be a reference to the comment.

>>! In null, @Mnkras wrote:
> It seems this no longer is working correctly:
> 
> {F1214970}
> (taken on this install right now)