data parameter is nil 异常处理

似乎是NSData的问题，用排除法分析了一下

     NSString *urlStr = [NSString stringWithFormat:@"%@/config/AppConfig.json",*******];
    [NetRequestHelp createNetRequestWithURL:urlStr parameters:nil requestType:CYRequestMethodTypeGET responseSeializerType:CYResponseSeializerTypeData completionHandle:^(BOOL success, id responseObject, NSString *message) {
        if(success)
            {
            NSDictionary *configDic = [JSONHelp JSONObjectWithData:responseObject];//当此处的responseObject为空的时候，就会报上面错误
            [configDic writeToFile:APP_CONFIG atomically:YES]; 

            } else { 

            }
    }];

此时在if(success){ }里面再加一层判断即可避免报上述错误

        if(responseObject == null) { 

            NSDictionary *configDic = [JSONHelp JSONObjectWithData:responseObject];//当此处的responseObject为空的时候，就会报上面错误
            [configDic writeToFile:APP_CONFIG atomically:YES]; 

            } else { 

            }