fix OLView schema building (cherry picked from commit 3e236a8)
fix OLView schema building
(cherry picked from commit 3e236a8)

kalxas/ckanext-geoview,pduchesne/ckanext-geoview,pduchesne/ckanext-geoview,kalxas/ckanext-geoview,singularita-corp/ckanext-geoview,ckan/ckanext-geoview,kalxas/ckanext-geoview,ckan/ckanext-geoview,singularita-corp/ckanext-geoview,singularita-corp/ckanext-geoview,pduchesne/ckanext-geoview,ckan/ckanext-geoview