Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/koji/daemon.py", line 1210, in runTask
    response = (handler.run(),)
  File "/usr/lib/python2.4/site-packages/koji/tasks.py", line 162, in run
    return koji.util.call_with_argcheck(self.handler, self.params, self.opts)
  File "/usr/lib/python2.4/site-packages/koji/util.py", line 156, in call_with_argcheck
    return func(*args, **kwargs)
  File "/usr/sbin/kojid", line 4786, in handler
    output += " %s\r\n" % '/'.join([buildurl, task['build_arch'], file_])
TypeError: sequence item 1: expected string, NoneType found