HBASE-4088 npes in server shutdown

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1145855 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -407,6 +407,7 @@ Release 0.90.4 - Unreleased
                are hosted by the HRegionServer (Akash Ashok)
    HBASE-4033  The shutdown RegionServer could be added to
                AssignmentManager.servers again (Jieshan Bean)
+   HBASE-4088  npes in server shutdown
 
   IMPROVEMENT
    HBASE-3882  hbase-config.sh needs to be updated so it can auto-detects the

src/main/java/org/apache/hadoop/hbase/master/handler/ServerShutdownHandler.java

@@ -186,7 +186,8 @@ public class ServerShutdownHandler extends EventHandler {
       }
     }
 
-    LOG.info("Reassigning " + hris.size() + " region(s) that " + serverName +
+    LOG.info("Reassigning " + (hris == null? 0: hris.size()) +
+      " region(s) that " + serverName +
       " was carrying (skipping " + regionsInTransition.size() +
       " regions(s) that are already in transition)");