Avoid showing class category if there are no classes in the category.
Avoid showing class category if there are no classes in the category.



Former-commit-id: 737c1beded9e22d5e75fc27737e2f615e25dac0d
julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine