No continuance shall be granted for a longer period than seven days, unless upon cause shown to the court of the existence of extraordinary causes and then not unless the defendant applying therefor shall give an undertaking to the adverse party, with good and sufficient surety to be approved by the court, conditioned for the payment of any rents that have or may accrue, and any additional damages that may be sustained by such adverse party by reason of the continuance, if judgment be rendered against the defendant.