Fix allow media id of user to be null

src/lib/models/User.ts

@@ -103,10 +103,9 @@ export class User extends Model<User> {
      * The id of the media that is the users profile picture
      */
     @ForeignKey(() => Media)
-    @Column({allowNull: false})
+    @Column({allowNull: true})
     public mediaId: number;
 
-
     /**
      * The media of the user
      */