travis run: https://travis-ci.org/bitcoin/bitcoin/jobs/406813397

```
rpc_psbt.py failed, Duration: 4 s
stdout:
2018-07-22T13:28:57.765000Z TestFramework (INFO): Initializing test directory /tmp/bitcoin_test_runner_20180722_132530/rpc_psbt_49
2018-07-22T13:29:00.531000Z TestFramework (ERROR): Assertion failed
Traceback (most recent call last):
  File "/home/travis/build/bitcoin/bitcoin/build/bitcoin-x86_64-unknown-linux-gnu/test/functional/test_framework/test_framework.py", line 160, in main
    self.run_test()
  File "/home/travis/build/bitcoin/bitcoin/build/bitcoin-x86_64-unknown-linux-gnu/test/functional/rpc_psbt.py", line 101, in run_test
    assert_raises_rpc_error(-22, "TX decode failed", self.nodes[0].converttopsbt, signedtx['hex'])
  File "/home/travis/build/bitcoin/bitcoin/build/bitcoin-x86_64-unknown-linux-gnu/test/functional/test_framework/util.py", line 105, in assert_raises_rpc_error
    assert try_rpc(code, message, fun, *args, **kwds), "No exception raised"
AssertionError: No exception raised
}
    }
    
    
    UniValue removed(UniValue::VARR);
    while (include_removed && altheight && *altheight > *height) {
        CBlock block;
        if (!pwallet->chain().findBlock(blockId, &block) || block.IsNull()) {
            throw JSONRPCError(RPC_INTERNAL_ERROR, "Can't read block from disk");
        }
        for (const CTransactionRef& tx : block.vtx) {
            auto it = pwallet->mapWallet.find(tx->GetHash());
            if (it != pwallet->mapWallet.end()) {
                
                
                ListTransactions(*locked_chain, pwallet, it->second, -100000000, true, removed, filter, nullptr );
            }
        }
        blockId = block.hashPrevBlock;
        --*altheight;
    }
    int last_height = tip_height ? *tip_height + 1 - target_confirms : -1;
    uint256 lastblock = last_height >= 0 ? locked_chain->getBlockHash(last_height) : uint256();
    UniValue ret(UniValue::VOBJ);
    ret.pushKV("transactions", transactions);
    if (include_removed) ret.pushKV("removed", removed);
    ret.pushKV("lastblock", lastblock.GetHex());
    return ret;
}
static UniValue gettransaction(const JSONRPCRequest& request)