pkuwm commented on a change in pull request #339: Implementation of 
stateModelDef modification in REST 2.0
URL: https://github.com/apache/helix/pull/339#discussion_r305560197
 
 

 ##########
 File path: 
helix-rest/src/main/java/org/apache/helix/rest/server/resources/helix/ClusterAccessor.java
 ##########
 @@ -431,9 +426,104 @@ public Response 
getClusterStateModelDefinition(@PathParam("clusterId") String cl
     StateModelDefinition stateModelDef =
         
dataAccessor.getProperty(dataAccessor.keyBuilder().stateModelDef(statemodel));
 
+    if (stateModelDef == null) {
+      return  notFound();
 
 Review comment:
   Can we remove the extra space? It would be great to keep the code quality 
for open source :-)

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