Refactoring the code

src/main/java/org/leolo/nrdatad/model/SmartEvent.java

@@ -20,6 +20,8 @@ public enum SmartEvent {
     }
 
     public static SmartEvent parseCode(@NotNull String code){
+        if(code==null)
+            return null;
         for(SmartEvent se: SmartEvent.values()){
             if(code.equalsIgnoreCase(se.code)){
                 return se;

src/main/java/org/leolo/nrdatad/model/SmartStepType.java

@@ -54,6 +54,8 @@ public enum SmartStepType {
     }
 
     public static SmartStepType parseCode(@NotNull String code){
+        if(code==null)
+            return null;
         for(SmartStepType sst: SmartStepType.values()){
             if(code.equalsIgnoreCase(sst.code))
                 return sst;