default to None for room topic event in spaces or /publicRooms

Signed-off-by: strawberry <strawberry@puppygock.gay>

src/api/client_server/directory.rs

@@ -246,7 +246,8 @@ pub(crate) async fn get_public_rooms_filtered_helper(
                                 error!("Invalid room topic event in database for room {}", room_id);
                                 Error::bad_database("Invalid room topic event in database.")
                             })
-                    })?,
+                    })
+                    .unwrap_or_default(),
                 world_readable: services()
                     .rooms
                     .state_accessor

src/service/rooms/spaces/mod.rs

@@ -346,7 +346,8 @@ impl Service {
                             error!("Invalid room topic event in database for room {}", room_id);
                             Error::bad_database("Invalid room topic event in database.")
                         })
-                })?,
+                })
+                .unwrap_or_default(),
             world_readable: services()
                 .rooms
                 .state_accessor