fix bug 类型转换异常

ad-engine-service/src/main/java/com/tzld/piaoquan/ad/engine/service/predict/impl/PredictModelServiceImpl.java

@@ -107,8 +107,8 @@ public class PredictModelServiceImpl implements PredictModelService {
             return result;
         }
 
-        String[] noAdGroupWithVideoMapping=(String[]) ((JSONArray) abtestParam.get("no_ad_mid_group_list")).toArray();
-
+        String[] noAdGroupWithVideoMapping=new String[0];
+        noAdGroupWithVideoMapping=((JSONArray) abtestParam.get("no_ad_mid_group_list")).toArray(noAdMidGroupList);
 
 
         //设置信息