YARN-524 TestYarnVersionInfo failing if generated properties doesn't include an SVN URL

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1463300 13f79535-47bb-0310-9956-ffa450edef68
(cherry picked from commit 7c65dbb9385567fe1d8e280b81ecb97b109d18a8)

Conflicts:
	hadoop-yarn-project/CHANGES.txt

(cherry picked from commit 5ca4f0f82e41c2833fd8520bc1f764a3f958bdf6)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/test/java/org/apache/hadoop/yarn/util/TestYarnVersionInfo.java

@@ -40,11 +40,11 @@ public class TestYarnVersionInfo {
     // make sure they aren't Unknown
     assertTrue("getVersion returned Unknown", !YarnVersionInfo.getVersion().equals("Unknown"));
     assertTrue("getUser returned Unknown", !YarnVersionInfo.getUser().equals("Unknown"));
-    assertTrue("getUrl returned Unknown", !YarnVersionInfo.getUrl().equals("Unknown"));
     assertTrue("getSrcChecksum returned Unknown", !YarnVersionInfo.getSrcChecksum().equals("Unknown"));
 
     // these could be Unknown if the VersionInfo generated from code not in svn or git
     // so just check that they return something
+    assertNotNull("getUrl returned null", YarnVersionInfo.getUrl());
     assertNotNull("getRevision returned null", YarnVersionInfo.getRevision());
     assertNotNull("getBranch returned null", YarnVersionInfo.getBranch());