IDEA-217556 Variables panel shows invalid value for one of HashMap entries

GitOrigin-RevId: ee89905d64f1069acd27302a8909de7270b5d24e

java/debugger/impl/src/com/intellij/debugger/settings/NodeRendererSettings.java

@@ -478,6 +478,7 @@ public class NodeRendererSettings implements PersistentStateComponent<Element> {
         descriptor.putUserData(key, evalDescriptor);
         return evalDescriptor.getValueLabel();
       }
+      descriptor.putUserData(key, null);
       return "null";
     }