fixed bug where AI wins in connect 4: found by Sondre

src/main/java/inf101/v20/sem2/twoPlayerGame/TwoPlayerGame.java

@@ -142,7 +142,7 @@ public class TwoPlayerGame<T extends MNKGame> {
 		HumanPlayer pl = (HumanPlayer) currentPlayer;
 		pl.makeMove(currentGame, x, y);
 		currentPlayer = next();
-		if(currentPlayer instanceof AIPlayer) {
+		if(hasPossibleMoves() && currentPlayer instanceof AIPlayer) {
 			takeTurnForAI();
 		}
 	}