fix error handling and debug

inventory/models.py

@@ -417,17 +417,22 @@ class CagetteInventory(models.Model):
 
                 # Set inventory as 'done' even if some products missed
                 res = api.execute('stock.inventory', 'action_validate', [inv])
-                if not res:
-                    action_validate_issue = "Action validate did not return True"
+                if res is True:
+                    done.append('Closed inventory')
+                else:
+                    action_validate_issue = "Action validate did not return True."
                     coop_logger.error(action_validate_issue)
                     errors.append(action_validate_issue)
-                    if 'name' in res:
-                        coop_logger.error('Action validate returned wizard named %s', res['name'])
-                        error.extend(
+                    if isinstance(res, dict) and 'name' in res:
+                        coop_logger.error('Action validate wanted to return wizard named %s which is not possible from third-party app.', res['name'])
+                        error.extend([
                             'Action validate wanted to return wizard named :',
                             res['name'],
                             'which is not possible from third-party app.'
-                        )
+                        ])
+                    else: #well, in that case, just try to print the value returned by res to help debugging...
+                        coop_logger.error(res)
+                        errors.append(res)
                 done.append('Closed inventory')
         except Exception as e:
             if not (MARSHALL_ERROR in str(e)):