Related: tdf#145169 append null on unknown property

otherwise the next known property will appear at the skipped unknown
property, resulting in "true" for IsHidden getting used as "TargetURL"

Change-Id: I0797db9eab94c175b5cc32c66051a1aa35be99c5
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/123804
Reviewed-by: Justin Luth <justin_luth@sil.org>
Tested-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/ucb/source/ucp/gio/gio_content.cxx b/ucb/source/ucp/gio/gio_content.cxx
index 7278a79..1e084d6 100644
--- a/ucb/source/ucp/gio/gio_content.cxx
+++ b/ucb/source/ucp/gio/gio_content.cxx
@@ -543,6 +543,7 @@ css::uno::Reference< css::sdbc::XRow > Content::getPropertyValues(
            SAL_WARN(
                "ucb.ucp.gio",
                "Looking for unsupported property " << rProp.Name);
            xRow->appendVoid(rProp);
        }
    }