Can not delete purchase requests has purchase line and draft state and origin from stock.order_point
When a user run "Stock supply" wizard, [try to delete purchase requests in draft state and origin is "stock.order_point"](https://foss.heptapod.net/tryton/tryton/-/blob/e22a65f1e2678477e4df19daa0bb1d23ff26a9b7/modules/stock_supply/purchase_request.py#L143). Since #11479 remove ```('purchase_line', '=', None)```. Current code, return purchase request in draft state and maybe has related to purchase line. Finally, [purchase_request module can not delete a purchase request in draft state and has "purchase line"](https://foss.heptapod.net/tryton/tryton/-/blob/e22a65f1e2678477e4df19daa0bb1d23ff26a9b7/modules/purchase_request/purchase_request.py#L286): > You cannot delete purchase request "%(request)s" because it is purchased.
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