R add isError and isSuccess method

RuoYi

2022-09-12 f5bec709111dcf7a2d9900b19e8b8c5b1162c55c

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package com.ruoyi.common.exception; 
 
/** 
 * 演示模式异常 
 *  
 * @author ruoyi 
 */ 
public class DemoModeException extends RuntimeException 
{ 
    private static final long serialVersionUID = 1L; 
 
    public DemoModeException() 
    { 
    } 
}