title: subgit fails with 'svn: E204900: File <filename> doesn't exist but should'
body: <p>I'm migrating a big SVN repository (11K revisions and lots of big files).</p>
  
  <p>After resuming several times due to communication problems, it started to fail with this message:</p>
  
  <blockquote>
    <p>SubGit version 3.2.5 ('Bobique') build #3694</p>
    
    <p>Translating Subversion revisions to Git commits...</p>
    
    <p>INSTALLATION FAILED</p>
    
    <p>error: svn: E204900: File  doesn't exist but should
    error: File MCCResources.properties doesn't exist but should
    error: Unexpected error has occurred; please report along with the logs ('\subgit-install-20170812-164015.zip')
    error:   to <a href="http://issues.tmatesoft.com/" rel="nofollow noreferrer">http://issues.tmatesoft.com/</a>, thank you!</p>
  </blockquote>
  
  <p>When I read the logs, I found the exact file and revision subgit is complaining about. As there's no evident SVN working copy, I tried to see if the file is missing from SVN repo at the given revision. It is there! I even checked the diff and it is totally fine.</p>
  
  <p>This error is not allowing me to continue with the migration and I don't want to restart it unless I can guarantee that it won't fail, it took 1 week to get to this point (26%).</p>