[minor] validate invoice number is selected in Payment Reconciliation

erpnext/accounts/doctype/payment_reconciliation/payment_reconciliation.py

@@ -141,6 +141,9 @@ class PaymentReconciliation(Document):
 
 	def reconcile(self, args):
 		for e in self.get('payments'):
+			if not e.invoice_number:
+				frappe.throw(_("Row {0}: Please select Invoice Number for reconcilation").format(e.idx))
+
 			if " | " in e.invoice_number:
 				e.invoice_type, e.invoice_number = e.invoice_number.split(" | ")