fix smart button Generated Lots error

models/stock_picking.py

@@ -39,13 +39,31 @@ class StockPicking(models.Model):
         subcontract_moves = self.move_ids.filtered('is_subcontract')
         lot_ids = subcontract_moves.move_line_ids.mapped('lot_id').ids
         
+        if not lot_ids:
+            return {
+                'type': 'ir.actions.client',
+                'tag': 'display_notification',
+                'params': {
+                    'title': 'No Lots Found',
+                    'message': 'No lots have been generated for subcontract moves yet.',
+                    'type': 'info',
+                    'sticky': False,
+                }
+            }
+        
+        # Create a simple action to view the lots
         return {
-            'name': 'Generated Lots',
+            'name': f'Generated Lots ({len(lot_ids)})',
             'type': 'ir.actions.act_window',
             'res_model': 'stock.lot',
-            'view_mode': 'tree,form',
+            'view_mode': 'list,form',
+            'views': [(False, 'list'), (False, 'form')],
             'domain': [('id', 'in', lot_ids)],
-            'context': {'create': False},
+            'context': {
+                'create': False,
+                'edit': False,
+            },
+            'target': 'current',
         }
 
     def action_auto_generate_lots_subcontract(self):