HDFS-2625. TestDfsOverAvroRpc failing after introduction of HeartbeatResponse type. Contributed by Todd Lipcon.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-1623@1210342 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/CHANGES.HDFS-1623.txt

@@ -43,3 +43,5 @@ HDFS-2623. Add test case for hot standby capability (todd)
 HDFS-2626. BPOfferService.verifyAndSetNamespaceInfo needs to be synchronized (todd)
 
 HDFS-2624. ConfiguredFailoverProxyProvider doesn't correctly stop ProtocolTranslators (todd)
+
+HDFS-2625. TestDfsOverAvroRpc failing after introduction of HeartbeatResponse type (todd)

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java

@@ -921,7 +921,7 @@ public class DatanodeManager {
       }
     }
 
-    return null;
+    return new DatanodeCommand[0];
   }
 
   /**