An affidavit, signed by the executor or administrator and declaring upon oath or affirmation that the executor or administrator has diligently inquired and can obtain no knowledge of any goods or chattels of the decedent, shall be a sufficient excuse for not delivering an inventory; and a like affidavit that the executor or administrator has diligently inquired and can obtain no knowledge of any debts or credits due or belonging to the decedent shall be a sufficient excuse for not delivering a list. Such affidavit shall be certified by the Register of Wills and filed with the bond.