wcs_api: adapt to change in formdefs API (fixes #20383)

wcs_olap/wcs_api.py

@@ -2,10 +2,15 @@ import requests
 import urlparse
 import urllib
 import isodate
+import logging
+
 
 from . import signature
 
 
+logger = logging.getLogger(__name__)
+
+
 class WcsApiError(Exception):
     pass
 
@@ -217,7 +222,17 @@ class WcsApi(object):
 
     @property
     def formdefs(self):
-        return [FormDef(wcs_api=self, **d) for d in self.get_json(self.formdefs_url)
+        result = self.get_json(self.formdefs_url)
+        if isinstance(result, dict):
+            if result['err'] == 0:
+                data = result['data']
+            else:
+                logger.error(u'could not retrieve formdefs from %s, err_desc: %s',
+                             self.formdefs_url, result.get('err_desc'))
+                return []
+        else:
+            data = result
+        return [FormDef(wcs_api=self, **d) for d in data
                 if not self.slugs or d['slug'] in self.slugs]
 
     @property