Feesql 扩展中添加 Searchs 会导致异常

[j4587698]

Is there an existing issue for this?

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Describe the bug

目前的Freesql扩展使用搜索时会报sql错误。
检查发现在ToDynamicFilter方法中仅判断了if (actions.Filters != null)
而SearchFilterAction中GetFilterConditions并没有给Filters 赋值
就会导致产生一个key和value都为null的条件，freesql转为sql时就会产生一个(())的条件，sql异常

Expected Behavior

搜索栏输入任意内容

此时searches里有一条数据

这时候SearchFilterAction中由于没有加Filter，所以actions.Filters是null

这时候item里内容都为null，所以会产生一个(())的条件

Steps To Reproduce

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Exceptions (if any)

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.NET Version

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Anything else?

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[bb-auto]

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