[FIX] account_payment_order: fix create name

The ir.sequence based naming doesn't work when creating a Payment Order
from the list view.

account_payment_order/models/account_payment_order.py

@@ -219,7 +219,7 @@ def _compute_move_count(self):
     @api.model_create_multi
     def create(self, vals_list):
         for vals in vals_list:
-            if vals.get("name", "New") == "New":
+            if vals.get("name") in ("New", None, False):
                 vals["name"] = (
                     self.env["ir.sequence"].next_by_code("account.payment.order")
                     or "New"