Handle shipment exception does not keep Shopify fulfillment status to partial
Job [#2379776](https://foss.heptapod.net/tryton/tryton/-/jobs/2379776) failed for 3ba724517b6c285a2cfe7191bf8f531eb1cfa09f:
```
File "/builds/tryton/tryton/modules/web_shop_shopify/tests/scenario_web_shop_shopify.rst", line 592, in scenario_web_shop_shopify.rst
Failed example:
order.fulfillment_status
Expected:
'partial'
Got:
'fulfilled'
```
issue