Don't fail outright when a play has an empty hosts list

lib/ansible/executor/playbook_executor.py

@@ -120,7 +120,6 @@ class PlaybookExecutor:
                             if len(batch) == 0:
                                 self._tqm.send_callback('v2_playbook_on_play_start', new_play)
                                 self._tqm.send_callback('v2_playbook_on_no_hosts_matched')
-                                result = 1
                                 break
                             # restrict the inventory to the hosts in the serialized batch
                             self._inventory.restrict_to_hosts(batch)

lib/ansible/plugins/strategies/linear.py

@@ -122,9 +122,8 @@ class StrategyModule(StrategyBase):
         moving on to the next task
         '''
 
-        result = True
-
         # iteratate over each task, while there is one left to run
+        result     = True
         work_to_do = True
         while work_to_do and not self._tqm._terminated: