Using Jackson instead of Fastjson

dolphinscheduler-dao/src/main/java/org/apache/dolphinscheduler/dao/entity/ProcessDefinition.java

@@ -279,11 +279,16 @@ public class ProcessDefinition {
     }
 
     public void setGlobalParams(String globalParams) {
+        if (globalParams == null){
+            this.globalParamList = new ArrayList<>();
+        }else {
             try {
-            this.globalParamList = JSONUtils.getMapper().readValue(globalParams, new TypeReference<List<Property>>() {});
+                this.globalParamList = JSONUtils.getMapper().readValue(globalParams, new TypeReference<List<Property>>() {
+                });
             } catch (IOException e) {
                 logger.error("json parse exception!", e);
             }
+        }
         this.globalParams = globalParams;
     }