fix(India): Internal transfer check fix

(cherry picked from commit f0af24fc6d26040fa34fd7248bf38301897d9ca1)
diff --git a/erpnext/regional/india/utils.py b/erpnext/regional/india/utils.py
index 0faf80b..9493614 100644
--- a/erpnext/regional/india/utils.py
+++ b/erpnext/regional/india/utils.py
@@ -249,6 +249,9 @@
 	elif doctype in ("Purchase Invoice", "Purchase Order", "Purchase Receipt"):
 		destination_gstin = party_details.supplier_gstin
 
+	if not destination_gstin or party_details.gstin:
+		return False
+
 	if party_details.gstin == destination_gstin:
 		return True
 	else: