fix: hasValue should resolve null type #578
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When I am using the rc picker component,
I found that when value is null and defaultvalue is another value, the value of value will be used at this time
But when value is undefined and defaultvalue is another value, the value of defaultvalue will be used at this time
Finally, it was discovered that the useMergedState hook was called inside the rc picker, and there was a function called 'hasValue' inside that only judges undefined.
I think this is not as expected. The 'hasValue' method should be implemented with reference to 'isNil'