update saveExam rpc api

examcloud-core-examwork-api-provider/src/main/java/cn/com/qmth/examcloud/core/examwork/api/provider/ExamCloudServiceProvider.java

@@ -113,7 +113,9 @@ public class ExamCloudServiceProvider extends ControllerSupport implements ExamC
         Map<String, String> properties = req.getProperties();
         examInfo.setProperties(properties);
 
-        examInfo.setCallType(CallType.WHOLE_SET);
+        if(examInfo.getCallType() == null) {
+            examInfo.setCallType(CallType.WHOLE_SET);
+        }
         ExamEntity saved = examService.saveExam(examInfo, CURD.CREATION_OR_UPDATE);
 
         SaveExamResp resp = new SaveExamResp();