Party accounts if don't have default company (#18771)

Add check for get_default company
diff --git a/erpnext/accounts/party.py b/erpnext/accounts/party.py
index 26c2950..59936d5 100644
--- a/erpnext/accounts/party.py
+++ b/erpnext/accounts/party.py
@@ -292,8 +292,11 @@
 
 		party_account_currency = frappe.db.get_value("Account", account.account, "account_currency", cache=True)
 		existing_gle_currency = get_party_gle_currency(doc.doctype, doc.name, account.company)
-		company_default_currency = frappe.get_cached_value('Company',
-			frappe.db.get_default("Company"),  "default_currency")
+		if frappe.db.get_default("Company"):
+			company_default_currency = frappe.get_cached_value('Company',
+				frappe.db.get_default("Company"),  "default_currency")
+		else:
+			company_default_currency = frappe.db.get_value('Company', account.company, "default_currency")
 
 		if existing_gle_currency and party_account_currency != existing_gle_currency:
 			frappe.throw(_("Accounting entries have already been made in currency {0} for company {1}. Please select a receivable or payable account with currency {0}.").format(existing_gle_currency, account.company))
@@ -607,4 +610,4 @@
 		.format(("credit") if party_type == "Customer" else "debit", cond) , party_type)
 
 	if data:
-		return frappe._dict(data)
\ No newline at end of file
+		return frappe._dict(data)