[PM-14935] fix: null error when GroupsComponent first loads (#12013)

apps/web/src/app/admin-console/organizations/manage/groups.component.ts

@@ -59,6 +59,7 @@ type GroupDetailsRow = {
  * with members' names (who are assigned to the group) or collection names (which the group has access to).
  */
 const groupsFilter = (filter: string) => {
+  filter ??= "";
   const transformedFilter = filter.trim().toLowerCase();
   return (data: GroupDetailsRow) => {
     const group = data.details;