Fix build error for unimplemented method

Author: boxbeam

platforms/brigadier/src/redempt/ordinate/brigadier/BrigadierCommandConverter.java

@@ -15,7 +15,7 @@ public <C extends CommandComponent<T>> void register(Class<C> type, BrigadierAda
 	}
 
 	public CommandNode<T> convertToBrigadier(CommandBase<T> command) {
-	
+		return null;
 	}
 
 }