docx export: add unit test for 9751056
docx export: add unit test for 9751056

Change-Id: I25aa07d3e1811fdf4ab0124e14794e70d7de82ec

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