wcs: also get formdefs when getting categories (#8990)

combo/apps/wcs/models.py

@@ -159,7 +159,12 @@ class WcsBlurpMixin(object):
                 'default': {'title': wcs_site['title'], 'base_url': url}
             }
 
-            url += self.api_url + '?format=json'
+            url += self.api_url
+            if not '?' in url:
+                url += '?'
+            else:
+                url += '&'
+            url += 'format=json'
             if wcs_site.get('orig') and wcs_site.get('secret'):
                 url += '&orig=%s' % wcs_site['orig']
                 source['auth_mech'] = 'hmac-sha1'
@@ -294,7 +299,7 @@ class WcsFormsOfCategoryCell(WcsCommonCategoryCell, WcsBlurpMixin):
 
 @register_cell_class
 class CategoriesCell(WcsDataBaseCell):
-    api_url = 'categories'
+    api_url = 'api/categories/?full=on'
     variable_name = 'form_categories'
     template_name = 'combo/wcs/form_categories.html'