title: Sublimerge won't compare to other branch
body: <p>I'm having trouble with Sublimerge and comparing to another branch. When I type ctrl+alt+d and choose "Compare to Other Branch" I get a list of garbled branches. </p>
  
  <p><img src="https://i.stack.imgur.com/7YLSM.png" alt="Garbled Branch Names"></p>
  
  <p>If I choose any, like master, which is the one I'd like to diff with, I get an error message.</p>
  
  <p><img src="https://i.stack.imgur.com/jR2Bv.png" alt="enter image description here"></p>