Any person interested may appear and contest the will. Devisees, legatees or heirs of an estate may contest the will through their guardians or attorneys appointed by themselves, or by the court for that purpose; but a contest made by an attorney appointed by the court does not bar a contest, after probate, by the party so represented, if commenced within three (3) months from the date the will was admitted to probate; nor does the nonappointment of an attorney by the court of itself invalidate the probate of a will.