title: cannot rebase: you have unstaged changes git
body: <p>I am on a branch named new_nlp and when I do a git status, I get the following:</p>
  
  <pre><code># On branch new_nlp
  # Changed but not updated:
  #   (use "git add/rm &lt;file&gt;..." to update what will be committed)
  #   (use "git checkout -- &lt;file&gt;..." to discard changes in working directory)
  #
  #   deleted:    untitled.
  </code></pre>
  
  <p>I cannot see this file untitled as it is deleted. </p>
  
  <p>I want to switch to master and perform a rebase from new_nlp but when I checkout master and issue the command:</p>
  
  <pre><code>git rebase new_nlp
  </code></pre>
  
  <p>I get the following error message:</p>
  
  <pre><code>cannot rebase: you have unstaged changes
  D   untitled.
  </code></pre>
  
  <p>I cannot see this file and I have no idea how to delete it.  I have no idea how it got added.</p>
  
  <p>Does anyone know how I can get past this road block.  I have no idea why the file remains in the index.</p>