fix

mec-im/src/main/java/com/ym/filter/GlobalExceptionHandlerAdvice.java

@@ -93,7 +93,7 @@ public class GlobalExceptionHandlerAdvice {
     @ExceptionHandler(BizException.class)
     public BaseResponse<Object> handleBizException(BizException ex) {
         logException(ex);
-        return new BaseResponse<>(ex.getCode(), ex.getMessage(), "");
+        return new BaseResponse<>(ex.getCode(), ex.getMessage(), null);
     }
 
     private void logException(Exception ex) {