Commits on May 1, 2019

1. Fixes PhysicalResourceId KeyError when stack in ROLLBACK state …

   Currently, if we try to get facts from a CloudFormation Stack that is in
   `ROLLBACK` state, this module will throw a `KeyError` exception, given that the
   `PhysicalResourceId` key does not exist for every resource in the
   stack_resource_list. Using the dict `get` method would set the value to None
   (null) if the key does not exist:
   
   ```
      "stack_resources": {
          "AppSecurityGroup": "sg-XXXXXXXXXX",
          "testawsngxLaunchConfig": null,
          "testawsngxLoadBalancer": "arn:aws:elasticloadbalancing:eu-west-1:XXXXXXXX:loadbalancer/net/test-test-1P5RFLQ266GGP/XXXXXXXXXXXX",
          "testawsngxTargetGroup": "arn:aws:elasticloadbalancing:eu-west-1:XXXXXXX:targetgroup/test-test-1LDHMLKNWNA82/XXXXXXXXXXXX"
      },
   ```
   
   Fixes issue ansible#38033

   Denis Afonso committed May 1, 2019
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