MOD allow FnxSelect to be nullable
MOD allow FnxSelect to be nullable

Nullable selects will have their values reset to null when clicked on already selected value

Signed-off-by: Jiří Zůna <1b548d10035ae428195c41f5d55eedb1437ccd8a@zunovi.cz>

fnx-io/fnx_ui,fnx-io/fnx_ui,fnx-io/fnx_ui,fnx-io/fnx_ui