title: Unable to check diffs with TortoiseGit: "fatal: empty string is not a valid pathspec"
body: <p>Currently, I did a re-installation of my windows 10. I also installed Git and TortoiseGit.</p>
  
  <p>Right now when I try to check diffs I have theses two errors in a window:</p>
  
  <blockquote>
    <p>fatal: empty string is not a valid pathspec, please use . instead if
    you meant to match all paths</p>
  </blockquote>
  
  <p>I click ok, then the other window error is:</p>
  
  <blockquote>
    <p>Failed to get UnRev file list fatal: empty string is not a valid
    pathspec, please use . instead if you meant to match all paths</p>
  </blockquote>
  
  <p>I click ok and it does not show me any errors in the "working tree" diffs.</p>
  
  <p>Git.exe is in : </p>
  
  <blockquote>
    <p>C:\Program Files\Git\bin</p>
  </blockquote>
  
  <p>And the path is set correctly in the General menu (settings) of Tortoisegit.</p>
  
  <p>Anyone know how to fix this issue ? Thanks.</p>