Made sure the start button only has functionality when in a lobby

src/main/java/ch/unibas/dmi/dbis/cs108/multiplayer/client/Client.java

@@ -416,8 +416,12 @@ public class Client {
           removeLobbyFromGui(data);
           break;
         case GuiParameters.updateLobbyString:
+          if(!data.isEmpty()) {
             lobbyDisplayHandler.updateLobbies(data);
             ChatApp.getListController().updateList();
+          } else {
+            ChatApp.getListController().clearVBox();
+          }
           break;
         default:
           notificationTextDisplay(data);

src/main/java/ch/unibas/dmi/dbis/cs108/multiplayer/server/ClientHandler.java

@@ -415,6 +415,7 @@ public class ClientHandler implements Runnable {
           Thread t = new Thread(game);
           t.start();
           l.addGameToRunningGames(game);
+          sendMsgToClientsInLobby(Protocol.printToGUI + "$" + GuiParameters.viewChangeToGame + "$");
         } else {
           sendAnnouncementToClient("Only the admin can start the game");
         }

src/main/java/ch/unibas/dmi/dbis/cs108/multiplayer/server/JServerProtocolParser.java

@@ -115,7 +115,6 @@ public class JServerProtocolParser {
         break;
       case Protocol.startANewGame:
         h.startNewGame();
-        h.sendMsgToClientsInLobby(Protocol.printToGUI + "$" + GuiParameters.viewChangeToGame + "$");
         break;
       case Protocol.listGames:
         h.listGames();

src/main/java/ch/unibas/dmi/dbis/cs108/multiplayer/server/LobbyUpdater.java

@@ -27,6 +27,9 @@ public class LobbyUpdater implements Runnable{
         if (!Lobby.lobbies.isEmpty()) {
           client.sendMsgToClient(
               Protocol.printToGUI + "$" + GuiParameters.updateLobbyString + "$" + lobbiesAsString);
+        } else{
+          client.sendMsgToClient(
+              Protocol.printToGUI + "$" + GuiParameters.updateLobbyString + "$");
         }
       }
     }