Share some code for validating vendor field

and add validation for new Ordering batch

tailbone/views/batch/vendorcatalog.py

@@ -260,13 +260,6 @@ class VendorCatalogView(FileBatchMasterView):
         else:
             f.remove('cache_products')
 
-    def valid_vendor_uuid(self, node, value):
-        model = self.model
-        if value:
-            vendor = self.Session.get(model.Vendor, value)
-            if not vendor:
-                raise colander.Invalid(node, "Vendor not found")
-
     def render_parser_key(self, batch, field):
         key = getattr(batch, field)
         if not key: