When nameDetailsVisible is set to false and an invalid/empty
string is passed to selectNameFilter(), the regexp used to
strip the filter off the suffixes returns empty and a crash
occurs.
Change-Id: I926ea49514ff25a103977d8121fca1cf83d647f5
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@digia.com>
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>