edit->changes->show has empty filter settings

Change-Id: I98999c0f402cf84d89b3a1167480dc27fdbc2be9
(cherry picked from commit 55c413b9cb2692b784c6c43a519be08146438237)
Reviewed-on: https://gerrit.libreoffice.org/7995
Tested-by: Michael Stahl <mstahl@redhat.com>
Reviewed-by: Michael Stahl <mstahl@redhat.com>