Optimize ParameterUtils.curingGlobalParams() execution efficiency (#2090)

* Optimize ParameterUtils.curingGlobalParams() execution efficiency

* Remove excess null check

dolphinscheduler-common/src/main/java/org/apache/dolphinscheduler/common/utils/ParameterUtils.java

@@ -119,8 +119,13 @@ public class ParameterUtils {
    */
   public static String curingGlobalParams(Map<String,String> globalParamMap, List<Property> globalParamList,
                                    CommandType commandType, Date scheduleTime){
+
+    if (globalParamList == null || globalParamList.isEmpty()) {
+      return null;
+    }
+
     Map<String, String> globalMap = new HashMap<>();
-      if(globalParamMap!= null){
+    if (globalParamMap!= null){
       globalMap.putAll(globalParamMap);
     }
     Map<String,String> allParamMap = new HashMap<>();
@@ -132,9 +137,7 @@ public class ParameterUtils {
       allParamMap.putAll(timeParams);
     }
 
-    if (globalMap != null) {
     allParamMap.putAll(globalMap);
-    }
 
     Set<Map.Entry<String, String>> entries = allParamMap.entrySet();
 
@@ -146,12 +149,7 @@ public class ParameterUtils {
         resolveMap.put(entry.getKey(),str);
       }
     }
-
-    if (globalMap != null){
     globalMap.putAll(resolveMap);
-    }
-
-    if (globalParamList != null && globalParamList.size() > 0){
 
     for (Property property : globalParamList){
       String val = globalMap.get(property.getProp());
@@ -161,8 +159,6 @@ public class ParameterUtils {
     }
     return JSONObject.toJSONString(globalParamList);
   }
-    return null;
-  }
 
 
   /**