修复自定义异常NPE问题

src/main/java/cn/zhangdeman/context/Response.java

@@ -128,7 +128,7 @@ public class Response<Data> implements Serializable {
 
     public Response<Data> failure(RuntimeContext runtimeContext, HttpStatus httpStatus, CustomException customException) {
         setHandleSuccess(false);
-        setErrorDetail(customException.getCause().toString()); // 异常堆栈
+        setErrorDetail(customException.getData()); // 异常堆栈
         // 错误码使用 category+_+code
         return any(runtimeContext, httpStatus, customException.getCategory() + "_"+customException.getCode(), customException.getMessage(), null);
     }