don't write invalid OOXMl files with invalid fill colors
don't write invalid OOXMl files with invalid fill colors

Change-Id: I4262b31978b9c932cc33b5442cf731f7f45cadc3

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