Don't crash with empty *pTxt
Don't crash with empty *pTxt

Change-Id: I5fdd0cbc70dec1119b1b6a76cb3c5805f11c11ed

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