wcs: skip errors when retrieving user forms/drafts (#21200)

combo/apps/wcs/models.py

@@ -192,6 +192,9 @@ class WcsBlurpMixin(object):
                     wcs_site['data'] = json_response
                 elif json_response.get('err', 0) == 0:
                     wcs_site['data'] = json_response['data']
+                else:
+                    # skip errors
+                    continue
                 # and mark all items with the site info
                 for item in wcs_site['data']:
                     item['site_slug'] = wcs_slug