Writer export: don't update doc stat using SkipImages
Writer export: don't update doc stat using SkipImages

to speed up text extraction

Change-Id: Ifa81483f537c8a79326c40fb610201f0bbbcc97a

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