throttle send_requests

lib/wallet.py

@@ -774,6 +774,8 @@ class Abstract_Wallet(PrintError):
         from util import format_time
         if conf == 0:
             tx = self.transactions.get(tx_hash)
+            if not tx:
+                return 3, 'unknown'
             is_final = tx and tx.is_final()
             fee = self.tx_fees.get(tx_hash)
             if fee and self.network and self.network.dynfee(0):