fix: 解决用户在插入链接时，如果没有填写链接地址，无法自定义给出错误提示的问题 #5820
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问题复现步骤：
1.给insertLink加上自定义校验函数checkLink，在不输入链接地址时，函数无法触发
查看源码后发现，代码检测到没有url时，直接就return了，不会执行自定义校验函数，故改变代码执行顺序