fix crash on exporting ooo23919-1.sxw to odt
fix crash on exporting ooo23919-1.sxw to odt

Change-Id: I3a249d1ee4a49dfc66d7d6052803b0896ae42d39

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