YARN-400. RM can return null application resource usage report leading to NPE in client (Jason Lowe via tgraves)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1448241 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-YAHOO-234-trunk-gd