regression from...

commit 8a08f686
Author: Mike <mikekaganski@hotmail.com>
Date:   Mon Apr 27 01:27:05 2015 +1000

    tdf#66141: SwTxtFrm::FormatQuick(bool) endless loop

    If a line happens to be invisible (e.g. in too thin cell of a table)
    then aLine.FormatLine(nStart) returns nStart, and
    aLine.Insert( new SwLineLayout() ) is executed until OOM.

keep the zero advance loop detection attempt, but allow the first
insertion and disallow subsequent inserts

Change-Id: I16380588220149cfd0ed0f835f08d2849180fece
(cherry picked from commit f06508e2)
Reviewed-on: https://gerrit.libreoffice.org/18908Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Miklos Vajna <vmiklos@collabora.co.uk>