Add empty search message

[citius]

Add empty message to options list if list is has no items. emptyMessage can be a string or a render function.

This feature is very useful in selector's "search mode"

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[tbleckert]

@citius Sorry for the late reply. Great work! Seems to work great. The only thing missing is a class name on the <li>. Like <li className={cls('not-found')}>. And maybe it should always be wrapped in that li, even if you provide your own function? Like the custom renderer for options.

[citius]

@citius Sorry for the late reply. Great work! Seems to work great. The only thing missing is a class name on the <li>. Like <li className={cls('not-found')}>. And maybe it should always be wrapped in that li, even if you provide your own function? Like the custom renderer for options.

Agree. I've patched a code. Please, review.

[tbleckert]

@citius Looks great!