ovirt_networks: Fix label assigment condition (#31772)

lib/ansible/modules/cloud/ovirt/ovirt_networks.py

@@ -149,9 +149,11 @@ class NetworksModule(BaseModule):
         self._update_label_assignments(entity)
 
     def _update_label_assignments(self, entity):
+        if self.param('label') is None:
+            return
+
         labels = [lbl.id for lbl in self._connection.follow_link(entity.network_labels)]
         labels_service = self._service.service(entity.id).network_labels_service()
-
         if not self.param('label') in labels:
             if not self._module.check_mode:
                 if labels: