Di Li created AMBARI-18588:

             Summary: Ambari server should not crash with NPE when parsing HTTP 
response for YARN RM properties
                 Key: AMBARI-18588
                 URL: https://issues.apache.org/jira/browse/AMBARI-18588
             Project: Ambari
          Issue Type: Bug
          Components: ambari-server
    Affects Versions: trunk
            Reporter: Di Li
            Assignee: Di Li
             Fix For: trunk

When YARN RM HTTP response is a 404, the response body is empty and this 
results in an empty responseMap, that later caused Ambari server to crash with 
NPE when it tries to read properties from the responseMap.

This JIRA proposes to set property values as null when the responseMap is null 
(due to empty body passed back from the YARN web server side).

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