properly check "search" property value

[rutsky]

Fixes react warning when passing "search={false}".

[Lapple]

Thanks, but will the warning go away if you simply pass oneOfType array of func and boolean?

[rutsky]

@Lapple, yes, but then it will be possible to pass true value, which isn't allowed (and looks like will lead to internal exception).

[Lapple]

While technically this is possible, I am not sure if that is a common pitfall. I agree with the PR subject that passing false should not trigger a warning that contradicts with the docs. I just think that having such an extensive error reporting costs too much for the value it brings. Do you agree?

[rutsky]

I agree that there is a lot of code for a very small and uncommon bug.

I thought to write oneOfType(boolean, function) initially, but decided that this is technically not correct due to missing true value case.

If you want, I can push oneOfType solution.

[rutsky]

I pushed in this branch incorrectly checked isRequired fix.

I checked that:

• if property is omitted internal search box appears,
• passing false disables internal search box,
• passing string leads to React warning (followed by exception which is expected),
• passing true leads to exception (which is bug, but it's not worth fixing).

[Lapple]

Perfect, thank you!