Whenever a writ of scire facias sur mortgage has heretofore been issued against the real owner or owners of real estate without the original mortgagor or mortgagors having been joined as defendant or defendants, and a judgment of foreclosure secured in such case and the property sold by the sheriff, then, and in that event, the title acquired by the purchaser at such sale shall be a full and complete title even though the release of the holder of the mortgage to the original mortgagor or mortgagors, releasing him, her or them, and their heirs, executors and administrators, from all personal liability for the debt secured by the mortgage being foreclosed, was not filed before the issuance of the writ as required by law: Provided, That the original mortgagor or mortgagors, him, her or them, or their heirs, executors and administrators, be released by the mortgagee, his heirs, executors and administrators, from all personal liability for the debt secured by the mortgage by release filed in the proper office.