fix: Error in TDS computation summary

(cherry picked from commit f12deae24b7ab164edd0868a1254bdf28bfeac09)
diff --git a/erpnext/accounts/report/tds_payable_monthly/tds_payable_monthly.py b/erpnext/accounts/report/tds_payable_monthly/tds_payable_monthly.py
index 621b697..4a25bcd 100644
--- a/erpnext/accounts/report/tds_payable_monthly/tds_payable_monthly.py
+++ b/erpnext/accounts/report/tds_payable_monthly/tds_payable_monthly.py
@@ -44,7 +44,7 @@
 
 		if rate and tds_deducted:
 			row = {
-				'pan' if frappe.db.has_column('Supplier', 'pan') else 'tax_id': supplier_map.get(supplier).pan,
+				'pan' if frappe.db.has_column('Supplier', 'pan') else 'tax_id': supplier_map.get(supplier, {}).get('pan'),
 				'supplier': supplier_map.get(supplier).name
 			}