[ISSUE#728]check ChannelHandlerContext whether is null

[ISSUE#728]check ChannelHandlerContext whether is null

namesrv/src/main/java/org/apache/rocketmq/namesrv/processor/DefaultRequestProcessor.java

@@ -384,10 +384,12 @@ public class DefaultRequestProcessor extends AsyncNettyRequestProcessor implemen
 
         int wipeTopicCnt = this.namesrvController.getRouteInfoManager().wipeWritePermOfBrokerByLock(requestHeader.getBrokerName());
 
+        if (ctx != null) {
             log.info("wipe write perm of broker[{}], client: {}, {}",
                     requestHeader.getBrokerName(),
                     RemotingHelper.parseChannelRemoteAddr(ctx.channel()),
                     wipeTopicCnt);
+        }
 
         responseHeader.setWipeTopicCount(wipeTopicCnt);
         response.setCode(ResponseCode.SUCCESS);
@@ -502,7 +504,9 @@ public class DefaultRequestProcessor extends AsyncNettyRequestProcessor implemen
     }
 
     private RemotingCommand updateConfig(ChannelHandlerContext ctx, RemotingCommand request) {
+        if (ctx != null) {
             log.info("updateConfig called by {}", RemotingHelper.parseChannelRemoteAddr(ctx.channel()));
+        }
 
         final RemotingCommand response = RemotingCommand.createResponseCommand(null);
 
@@ -518,13 +522,6 @@ public class DefaultRequestProcessor extends AsyncNettyRequestProcessor implemen
                 return response;
             }
 
-            if (bodyStr == null) {
-                log.error("updateConfig get null body!");
-                response.setCode(ResponseCode.SYSTEM_ERROR);
-                response.setRemark("string2Properties error");
-                return response;
-            }
-
             Properties properties = MixAll.string2Properties(bodyStr);
             if (properties == null) {
                 log.error("updateConfig MixAll.string2Properties error {}", bodyStr);