Removes card from gssha project file

def deleteCard(self, card_name, db_session):
        """
        Removes card from gssha project file
        """
        card_name = card_name.upper()
        gssha_card = self.getCard(card_name)
        if gssha_card is not None:
            db_session.delete(gssha_card)
            db_session.commit()