Wrap up initial vendor catalog batch support etc.

* Adds the ability to delete all batch rows matching current query.
* Refactors some progress factory args.
* If batch initialization fails, don't persist batch.

tailbone/views/vendors/catalogs.py

@@ -26,6 +26,8 @@ Views for maintaining vendor catalogs
 
 from __future__ import unicode_literals
 
+from pyramid.httpexceptions import HTTPFound
+
 from rattail.db import model
 from rattail.db.api import get_setting, get_vendor
 from rattail.db.batch.vendorcatalog import VendorCatalog, VendorCatalogRow
@@ -129,7 +131,12 @@ class VendorCatalogCrud(FileBatchCrud):
 
     def init_batch(self, batch):
         parser = require_catalog_parser(batch.parser_key)
-        batch.vendor = get_vendor(Session, parser.vendor_key)
+        vendor = get_vendor(Session, parser.vendor_key)
+        if not vendor:
+            self.request.session.flash("No vendor setting found in database for key: {0}".format(parser.vendor_key))
+            return False
+        batch.vendor = vendor
+        return True
 
 
 class VendorCatalogRowGrid(BatchRowGrid):