loop out failes on testnet

[PatrickZGW]

When trying to use loop on testnet (loopd started with network=testnet option), the loop binary fails with this error:

pat@ubuntu:~/.lnd/data/chain/bitcoin/testnet$ loop out 1000000
Max swap fees for 1000000 loop out: 54972
CONTINUE SWAP? (y/n), expand fee detail (x): x

Max on-chain fee:                 411
Max off-chain swap routing fee:   50010
Max off-chain prepay routing fee: 422
Max swap fee:                     4129
Max no show penalty:              8258
CONTINUE SWAP? (y/n): y
[loop] rpc error: code = Unknown desc = invoice not for current active network 'testnet3'

Environment:

• loop version 0.0.1
• Linux ubuntu-s-2vcpu-2gb-fra1-01 4.15.0-38-generic loopd: fix nil ptr derefence for monitor #41-Ubuntu SMP Wed Oct 10 10:59:38 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux