fixed bug with AI player crashing in Connect Four

src/main/java/inf101/v20/sem2/twoPlayerGame/player/AI/SimpleAIPlayer.java

@@ -21,6 +21,7 @@ public class SimpleAIPlayer extends AbstractPlayer implements AIPlayer{
 					game.putPieceAt(i, j);
 					return;
 				}catch(IllegalArgumentException e) {
+				}catch(IllegalStateException e) {
 				}
 			}
 		}