[REVIEW 3-6] Prevent crash on loading xls with pivot table (fdo#54303)

[Kohei Yoshida]

Hi there,

I'd like

https://gerrit.libreoffice.org/gitweb?p=core.git;a=commitdiff;h=b4f913b5f5c48335dc80a5322b078e1d6ac2e3fe

cherry-picked to 3-6 in order to fix

https://bugs.freedesktop.org/show_bug.cgi?id=54303

Kohei

-- 
Kohei Yoshida, LibreOffice hacker, Calc