Avoid crash
Avoid crash

Sure, this is probably "defensive coding" and the root cause is my other
changes...

Change-Id: Ia888921fddc48dc022a3205c7e0abc7e2160cf5c

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