Merge "Handle non-existant plan when getting deployment status" into stable/queens

releasenotes/notes/handle-no-deployment-status-a8f73f887f0f158f.yaml

@@ -0,0 +1,4 @@
+---
+fixes:
+  - When requesting the deployment status of a non-existant plan, instead of
+    showing a traceback, show a helpful message indicating there is no status.

tripleoclient/v1/overcloud_deploy.py

@@ -1079,6 +1079,9 @@ class GetDeploymentStatus(command.Command):
             plan=plan
         )
 
+        if not status:
+            return
+
         payload = status['workflow_status']['payload']
         execution = payload['execution']
         table = PrettyTable(