Add more validations; avoid caching wrong answer in facet list
Add more validations; avoid caching wrong answer in facet list

balanced/PyXB,CantemoInternal/pyxb,CantemoInternal/pyxb,jonfoster/pyxb2,jonfoster/pyxb1,jonfoster/pyxb2,jonfoster/pyxb2,balanced/PyXB,jonfoster/pyxb-upstream-mirror,CantemoInternal/pyxb,jonfoster/pyxb1,jonfoster/pyxb-upstream-mirror,pabigot/pyxb,pabigot/pyxb,jonfoster/pyxb-upstream-mirror,balanced/PyXB