fix: ZeroDivisionError on creating e-invoice for credit note (#26915)

diff --git a/erpnext/regional/india/e_invoice/utils.py b/erpnext/regional/india/e_invoice/utils.py
index 4276946..fa7e88d 100644
--- a/erpnext/regional/india/e_invoice/utils.py
+++ b/erpnext/regional/india/e_invoice/utils.py
@@ -190,8 +190,10 @@
 		item.description = sanitize_for_json(d.item_name)
 
 		item.qty = abs(item.qty)
-
-		item.unit_rate = abs(item.taxable_value / item.qty)
+		if flt(item.qty) != 0.0:
+			item.unit_rate = abs(item.taxable_value / item.qty)
+		else:
+			item.unit_rate = abs(item.taxable_value)
 		item.gross_amount = abs(item.taxable_value)
 		item.taxable_value = abs(item.taxable_value)
 		item.discount_amount = 0