[PATCH] Fixed for svnlook.py Which Produces an Error When a Path is Deleted

Hi All,
    I found another issue with svnlook.py which resulted in an error.
In this scenario, whenever you deleted a path pointing to a file from
Subversion and then use svnlook.py's diff command to view the diff
output, an error is thrown:

python svnlook.py /opt/repos/svn/test/ rev 8 diff
Traceback (most recent call last):
  File "svnlook.py", line 386, in <module>
    main()
  File "svnlook.py", line 383, in main
    SVNLook(sys.argv[1], cmd, rev, txn)
  File "svnlook.py", line 38, in __init__
    getattr(self, 'cmd_' + cmd)()
  File "svnlook.py", line 70, in cmd_diff
    self._print_tree(DiffEditor, pass_root=1)
  File "svnlook.py", line 128, in _print_tree
    e_ptr, e_baton, authz_cb, 0, 1, 0, 0)
  File "/opt/subversion/lib/svn-python/libsvn/repos.py", line 294, in
svn_repos_dir_delta
    return apply(_repos.svn_repos_dir_delta, args)
  File "svnlook.py", line 294, in delete_entry
    self._do_diff(path, None)
  File "svnlook.py", line 268, in _do_diff
    print "Removed: " + path
TypeError: cannot concatenate 'str' and 'NoneType' objects

This patch fixes this issue and the result is an svnlook.py that
properly handles deleted files when using the diff command.

Take care,

Jeremy

P.S. - I emailed a patch earlier to fix diff in general. Without that
patch applied, you will error out before you get to the point in the
script that this patch fixes.

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