Fix n#653688
Fix n#653688

Seems our Zip package is a bit too strict in checking archive
consistency - surely writing it out correctly is good, but rejecting
otherwise fine odf is not.

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