Perform sanity checks on threshold values

def validate_options(subscription_key, text):
    """
    Perform sanity checks on threshold values
    """
    if not subscription_key or len(subscription_key) == 0:
        print 'Error: Warning the option subscription_key should contain a string.'
        print USAGE
        sys.exit(3)
    if not text or len(text) == 0:
        print 'Error: Warning the option text should contain a string.'
        print USAGE
        sys.exit(3)