No report or return made by any commissioners may be set aside and sent back to them or others for a new report because of any  defect or omission not affecting the substantial rights of the parties, but the defect or omission may be amended by the court, or by the commissioners with permission of the court. (1868-9, c. 93, s. 7; Code, s. 289; Rev., s. 724; C.S., s. 764.)