Don't disable registration for local instances and fix null room

src/settings.ts

@@ -12,4 +12,9 @@ class Settings {
   }
 }
 
-export default new Settings();
+const settingsSingleton = new Settings();
+if (process.env.ENV != 'prod') {
+  settingsSingleton.toggleDisableRegistration();
+}
+
+export default settingsSingleton;

src/sockets/filters/createRoomFilter.ts

@@ -2,13 +2,15 @@ import GameWrapper from '../../gameplay/gameWrapper';
 import { WAITING } from '../../gameplay/game';
 
 export class CreateRoomFilter {
-  // Returns true if user can chat. Else false.
+  // Returns true if user can create a room. Else false.
   createRoomRequest(username: string, rooms: GameWrapper[]): boolean {
     // User cannot make a room if they already have one that is in "waiting" status.
-    const waitingRooms = rooms.filter((room) => room.getStatus() == WAITING);
+    const waitingRooms = rooms.filter(
+      (room) => room && room.getStatus() === WAITING,
+    );
 
     const sameUserWithWaitingRooms = waitingRooms.filter(
-      (room) => room.host.toLowerCase() == username.toLowerCase(),
+      (room) => room.host.toLowerCase() === username.toLowerCase(),
     );
 
     return sameUserWithWaitingRooms.length === 0;