Backing out of a blank comment form shouldn't bother asking for confirmation - eviltoast

Say I start typing a comment, then decide to not bother. Instinctively I delete what I had typed, then press back. The UI asks me for confirmation to leave even though the field is blank. It should just go without confirmation if the field is blank.

I suspect it does this because it has a draft saved, but the current contents of the text box should take priority over a draft.