fix for message where there's no room available while typing /room

ChatApp/src/client/ClientConsole.java

@@ -144,10 +144,9 @@ public class ClientConsole implements ClientListener {
 
 	@Override
 	public void handleRoomList(List<String> roomNames) {
-		System.out.println("Rooms :");
+		System.out.println(roomNames.isEmpty()
-		for (String room : roomNames) {
+				? "No rooms available"
-			System.out.println("\t" + room);
+				: "Rooms : \n\t" + String.join("\n\t", roomNames));
-		}
 	}
 
 	@Override