don't blow up on .odt export with !hasValue footers/headers
don't blow up on .odt export with !hasValue footers/headers

Change-Id: I2507c23b7b17b9172f720548d32cdfe299d4fa20

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