protect against accessing before the start of pCode in FormulaCompiler

If the expression is bad, such as in sc/qa/.../sheet.fods, 'pCode - 1'
may actually refer before the array of tokens, since nothing has been
added yet. So make that element nullptr. This is a bit hackish, but
checking in every place that pCode is valid seems tedious.

Change-Id: Ia099a50583f60d93a2e20b1f7b5e44b0121a275b
Reviewed-on: https://gerrit.libreoffice.org/58198
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>

0 files changed, 0 insertions, 0 deletions