David Pursehouse b7151dd582 Fix exception in change list when change owner has no name
If a change owner has no name configured, attempting to view the list
of changes causes gertty to fail with:

  urwid.util.TagMarkupException: Invalid markup element: None

Change-Id: Idc0d13f4dfce45e29618c4abda7d6a70fc091e98
2014-09-10 12:09:57 +02:00
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