[hooks] Turn the error about incomplete configuration into a warning

To avoid cluttering the console.

utils.py

@@ -47,7 +47,7 @@ def ckan_instance_configured(cls, req, **kwargs):
     config = req.vreg.config
     for option in ('ckan-baseurl', 'ckan-api-key', 'ckan-organization'):
         if not config.get(option):
-            req.error('CKAN instance configuration incomplete, missing "%s" '
+            req.warning('CKAN instance configuration incomplete, missing "%s" '
                         'option' % option)
             return 0
     return 1