title: Cannot Git Blame files
body: <p>I use Xcode and this repo on two separate laptops.  On one laptop, in Xcode I can select the version editor pane and it shows me blame information on each line such as who made the commit and when.  However, on the other laptop I always get the error <code>could not blame {file}. Error: fatal: no such ref: HEAD</code>.</p>
  
  <p>I'm not sure what this means or how to fix it.  As I pull often, the repo's should be both very similar (barring gitignore differences or something). So I'm not sure whether or not there is a minor different in the .git folder on one laptop.  I know HEAD is a reference to a certain commit but beyond that I'm not sure how to fix this.</p>