fix: Ignore missing customer group while fetching price list

erpnext/accounts/test_party.py

@@ -0,0 +1,16 @@
+import frappe
+from frappe.tests.utils import FrappeTestCase
+
+from erpnext.accounts.party import get_default_price_list
+
+
+class PartyTestCase(FrappeTestCase):
+	def test_get_default_price_list_should_return_none_for_invalid_group(self):
+		customer = frappe.get_doc({
+			'doctype': 'Customer',
+			'customer_name': 'test customer',
+		}).insert(ignore_permissions=True, ignore_mandatory=True)
+		customer.customer_group = None
+		customer.save()
+		price_list = get_default_price_list(customer)
+		assert price_list is None