[#1473] allow empty string in owner org when there is no previous pac…

…kage or owner org

ckan/logic/validators.py

@@ -35,8 +35,9 @@ def owner_org_validator(key, data, errors, context):
     if value == '' :
         if not new_authz.check_config_permission('create_unowned_dataset'):
             raise Invalid(_('A organization must be supplied'))
+        package = context.get('package')
         # only sysadmins can remove datasets from org
-        if not user.sysadmin:
+        if package and package.owner_org and not user.sysadmin:
             raise Invalid(_('You cannot remove a dataset from an existing organization'))
         return