Merge JoinMarket-Org/joinmarket-clientserver#1357: Fix sendpayment without amount argument, BIP21 only

9d9035b43f Fix sendpayment without amount argument, BIP21 only (Kristaps Kaupe)

Pull request description:

  Fixes #1356. Bug was introduced with #1316.

Top commit has no ACKs.

Tree-SHA512: cc4be2c4e55720faa5a0ca834e6ff4b2b95dbcf5b96f7bc501e3fb0e94dcd14240c6bb3949068248206f5508f64d4cc2afe49344065cdc4d60edcb3ba01a41cc

scripts/sendpayment.py

@@ -96,7 +96,7 @@ def main():
                 sweeping = True
             destaddr = args[2]
         mixdepth = options.mixdepth
-        if btc.is_bip21_uri(args[2]):
+        if len(args) > 2 and btc.is_bip21_uri(args[2]):
             parsed = btc.decode_bip21_uri(args[2])
             if 'amount' in parsed:
                 parser.error("Specify amount as a separate argument or amount in BIP21 URI, not both.")