@staticmethod
def var_unset(session, name):
    """
        Unsets the given variable
        """
    name = name.strip()
    try:
        session.unset(name)
    except KeyError:
        session.write_line('Unknown variable: {0}', name)
        return False
    else:
        session.write_line('Variable {0} unset.', name)
    return None
