In any divorce suit wherein a bill of complaint or cross-bill prays for a divorce from the bonds of matrimony under § 20-91 or prays for a divorce from bed and board under § 20-95, at such time as there exists in either party’s favor grounds for a divorce from the bonds of matrimony under § 20-91 A (9), either party may move the court wherein such divorce suit is pending for a divorce from the bonds of matrimony on the grounds set out in § 20-91 A (9) without amending the bill of complaint or cross-bill.