Input checking

[Meuritz]

The game dosen't check the followings:

• When playing a card from the hand, if the cards are less than 9, an invalid index will be sent to the server, and the game will crash
• If the client sends a string or an invalid input to the server (varies whit the move chosen) the server will crash
• when getting a card from the board, a player can take an "empty card", if the player takes 2 times the same card, that card will be deleted
• possible error yet to be tested, if a player tries to take a card from another one that has no cards

Possible fixes

• send each time the number of available cards in the hand, and check the input for gibberish
• trow an error if a player tries to play an empty card, and recover by making him chose another one
• trow an error when a player tries to take a card from a player whit no cards in his hands, and make him do another choice or dont display the player whit 0 cards at all