title: GIT Repository: "invalid author/committer line - missing space before date"
body: <p>When trying to make a move to github from bitbucket I've encountered fatal error in one of commits:</p>
  
  <pre><code>error in commit d8b1774aa7bd98c6494a1e31acef943d0e0cbf03: missingSpaceBeforeDate: invalid author/committer line - missing space before date
  </code></pre>
  
  <p><code>cat-file</code> shows:</p>
  
  <pre><code>author john &lt;john@doe.com&gt;removed backup files. Modified  &lt;&gt; 1397201439 +0200
  committer john &lt;john@doe.com&gt; 1397201439 +0200
  </code></pre>
  
  <p>How can I amend this commit and add missing space?</p>