Whenever a Landlord and Tenant Writ has been entered with the Court, and neither an appearance nor the return of service of process has been filed with the Court within sixty days following the date of said entry, such action may upon motion or upon the Court's own motion be dismissed. The order of dismissal may be vacated upon motion after notice for cause shown upon such terms and conditions as the Court may impose. Any motion to vacate shall be filed within seven days after the date of the Clerk's Notice of the order of dismissal.