Populate data rows for new mobile purchasing batch, if applicable

i.e. if batch is meant for receiving an existing PO etc.

tailbone/views/purchases/batch.py

@@ -943,7 +943,10 @@ class PurchaseBatchView(BatchMasterView):
                         batch.created_by = self.request.user
                         kwargs = self.get_batch_kwargs(batch, mobile=True)
                         batch = self.handler.make_batch(self.Session(), **kwargs)
+                        if self.handler.requires_prefill(batch):
+                            self.handler.make_initial_rows(batch)
                         self.request.session.flash("Created new purchasing batch: {}".format(batch))
+                        # TODO: redirect to mobile receiving view etc. instead
                         return self.redirect(self.request.route_url('purchases.batch.mobile_create'))
 
         data['mode_title'] = self.enum.PURCHASE_BATCH_MODE[mode].capitalize()