Fix fdo#71527 no unguarded ptr dereference here.
Fix fdo#71527 no unguarded ptr dereference here.

This is the real problem - mxPane can be validly NULL.

Change-Id: Ie8d055db9bfb68cb9031fa970518343f5aec6619

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core