Victor Coutellier 3bb4c19981 Fix kolla-docker possible undefined variable
It is possible to reference undefined variable in kolla-docker module if
DockerWorker object initialization fail, so the current behaviour will
crash the playbook with the unwanted error message :

UnboundLocalError: local variable 'dw' referenced before assignment

Change-Id: Ic8d26b11f93255220888b5406f8ab4a6f81736c2
Closes-Bug: #1819361
2019-03-10 19:13:00 +01:00
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