fix: clear error message when approval not available (#23971)

diff --git a/erpnext/hr/doctype/department_approver/department_approver.py b/erpnext/hr/doctype/department_approver/department_approver.py
index 9b2de0e..d337959 100644
--- a/erpnext/hr/doctype/department_approver/department_approver.py
+++ b/erpnext/hr/doctype/department_approver/department_approver.py
@@ -20,7 +20,7 @@
 	approvers = []
 	department_details = {}
 	department_list = []
-	employee = frappe.get_value("Employee", filters.get("employee"), ["department", "leave_approver", "expense_approver", "shift_request_approver"], as_dict=True)
+	employee = frappe.get_value("Employee", filters.get("employee"), ["employee_name","department", "leave_approver", "expense_approver", "shift_request_approver"], as_dict=True)
 
 	employee_department = filters.get("department") or employee.department
 	if employee_department:
@@ -59,11 +59,9 @@
 				and approver.approver=user.name""",(d, "%" + txt + "%", parentfield), as_list=True)
 
 	if len(approvers) == 0:
-		frappe.throw(_("Please set {0} for the Employee or for Department: {1}").
-			format(
-				field_name, frappe.bold(employee_department),
-				frappe.bold(employee.name)
-			),
-			title=_(field_name + " Missing"))
+		error_msg = _("Please set {0} for the Employee: {1}").format(field_name, frappe.bold(employee.employee_name))
+		if department_list:
+			error_msg += _(" or for Department: {0}").format(frappe.bold(employee_department))
+		frappe.throw(error_msg, title=_(field_name + " Missing"))
 
 	return set(tuple(approver) for approver in approvers)