fix: validate if asset account is set against company

(cherry picked from commit c3e0de2)

erpnext/accounts/doctype/purchase_invoice/purchase_invoice.py

@@ -247,8 +247,15 @@ def set_expense_account(self, for_validate=False):
 				else:
 					item.expense_account = stock_not_billed_account
 			elif item.is_fixed_asset and not is_cwip_accounting_enabled(asset_category):
-				item.expense_account = get_asset_category_account('fixed_asset_account', item=item.item_code,
+				asset_category_account = get_asset_category_account('fixed_asset_account', item=item.item_code,
 					company = self.company)
+				if not asset_category_account:
+					form_link = get_link_to_form('Asset Category', asset_category)
+					throw(
+						_("Please set Fixed Asset Account in {} against {}.").format(form_link, self.company),
+						title=_("Missing Account")
+					)
+				item.expense_account = asset_category_account
 			elif item.is_fixed_asset and item.pr_detail:
 				item.expense_account = asset_received_but_not_billed
 			elif not item.expense_account and for_validate: