2019-08-28 20:47:30,368 ERROR zuul.DependentPipelineManager: Exception while reporting:
Traceback (most recent call last):
  File "/usr/share/python/zuul/local/lib/python2.7/site-packages/zuul/scheduler.py", line 1768, in _reportItem
    ret = self.sendReport(actions, self.pipeline.source, item)
  File "/usr/share/python/zuul/local/lib/python2.7/site-packages/zuul/scheduler.py", line 1293, in sendReport
    ret = reporter.report(source, self.pipeline, item)
  File "/usr/share/python/zuul/local/lib/python2.7/site-packages/zuul/reporter/gerrit.py", line 39, in report
    message, self.reporter_config)
  File "/usr/share/python/zuul/local/lib/python2.7/site-packages/zuul/connection/gerrit.py", line 287, in review
    if 'submit' in action and err and 'change is merged' in err:
UnboundLocalError: local variable 'err' referenced before assignment