Does the fact that a party merely failed to apply for a final decree of divorce constitute mistake, negligence or inadvertence?

Evidence alone that a party merely failed to apply for a final decree of divorce does not constitute mistake, negligence, or inadvertence, since '(t) here is no rule of law which compels a party to apply for a final decree and the circumstances may be such that a party does not wish to apply for one. Many factors may prompt inaction, i.e., there may have been a reconciliation or there may be hope of one. * * *' (Berry v. Berry, Supra, 140 Cal.App.2d at p. 60, 294 P.2d at p. 764.)