Needed for signaling the user when no match was found for
the searched input

Change-Id: I171ee956d94d6fd83036ae34102c2f1bdd5661de
Reviewed-on: https://gerrit.libreoffice.org/15798Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Miklos Vajna <vmiklos@collabora.co.uk>