Add render_vendor() method for VendorHandler

rattail/vendors/handler.py

@@ -26,6 +26,8 @@ Vendors Handler
 
 from __future__ import unicode_literals, absolute_import
 
+import six
+
 from rattail.app import GenericHandler
 from rattail.util import load_entry_points
 
@@ -78,6 +80,9 @@ class VendorHandler(GenericHandler):
         from rattail.db.api.vendors import get_vendor
         return get_vendor(session, key)
 
+    def render_vendor(self, vendor, **kwargs):
+        return six.text_type(vendor)
+
     def get_all_catalog_parsers(self):
         """
         Should return *all* catalog parsers known to exist.