use hasattr for config validation

ckanext/harvest/logic/validators.py

@@ -83,10 +83,7 @@ def harvest_source_config_validator(key,data,errors,context):
     for harvester in PluginImplementations(IHarvester):
         info = harvester.info()
         if info['name'] == harvester_type:
-            if info.get('form_config_interface','') != 'Text':
-                raise Invalid('This harvester does not allow configuration options: %s' % harvester_type)
-
-            if harvester.validate_config:
+            if hasattr(harvester, 'validate_config'):
                 try:
                     return harvester.validate_config(data[key])
                 except Exception, e:

ckanext/harvest/plugin.py

@@ -34,7 +34,6 @@ class Harvest(SingletonPlugin):
 
         map.connect('harvesting_job_create', '/harvest/refresh/:id',controller=controller, 
                 action='create_harvesting_job')
-      
         return map
 
     def update_config(self, config):