title: git rebase and deleted rebasing branches causing "Interactive rebase already started" error message
body: <p>I was trying something out with a couple of branches so I rebased on a temporary branch and was in the middle of resolving some conflicts when I decided to not to complete the rebase it out another way. I then deleted the temporary branch involved and went on my merry way. A couple of hours later I wanted to rebase another branch and get this error message</p>
  
  <pre><code>Interactive rebase already started
  </code></pre>
  
  <p><code>git rebase --abort</code> displays this error message</p>
  
  <pre><code>error: unable to resolve reference refs/heads/tmp/rails3-rails-2-fixes: No such file or directory
  fatal: Cannot lock the ref 'refs/heads/tmp/rails3-rails-2-fixes'.
  Could not move back to refs/heads/tmp/rails3-rails-2-fixes
  </code></pre>
  
  <p>Tried to just create another branch named <code>tmp/rails3-rails-2-fixes</code> but no dice</p>
  
  <p>Any ideas how I can resolve this?</p>