Remove as assertion that is triggered by bad data input, but does not indicate a code flaw.  Bugscape bug 53875. r=relyea
Remove as assertion that is triggered by bad data input, but does not
indicate a code flaw.  Bugscape bug 53875. r=relyea

thespooler/nss,thespooler/nss,thespooler/nss,thespooler/nss,thespooler/nss,thespooler/nss,thespooler/nss