rebalance-lnd crashing on exclusion of closed channel ids

[blckbx]

Background:

Rebalance-lnd crashes on closed channel ids.
I'm running several cronjobs of rebalance-lnd. Lately I closed a channel but forgot it was excluded in several rebalance-lnd cronjobs. Reading syslog it showed that rebalance-lnd was crashing.

*/5 * * * * /usr/bin/python3 /home/user/rebalance-lnd/rebalance.py -f -1 -t -1 --exclude <channel id of closed channel>

Your Environment:

• lnd-0.14.1-beta
• rebalance-lnd latest

Steps to reproduce:

• Run rebalance-lnd excluding a channel id that has been closed previously
• Watch traceback

Expected behaviour:

• Ignoring closed channel exclusion or warning message without traceback (?)

Actual behaviour:

• rebalance-lnd is throwing error "Unable to find channel edge " and traceback

Unable to find channel edge xxx
Traceback (most recent call last):
  File "/home/user/rebalance-lnd/rebalance.py", line 540, in <module>
    success = main()
  File "/home/user/rebalance-lnd/rebalance.py", line 326, in main
    return Rebalance(arguments).start()
  File "/home/user/rebalance-lnd/rebalance.py", line 258, in start
    return Logic(
  File "/home/user/rebalance-lnd/logic.py", line 82, in rebalance
    self.initialize_ignored_channels(routes, fee_limit_msat, min_fee_last_hop)
  File "/home/user/rebalance-lnd/logic.py", line 380, in initialize_ignored_channels
    routes.ignore_channel(chan_id)
  File "/home/user/rebalance-lnd/routes.py", line 132, in ignore_channel
    edge = self.lnd.get_edge(chan_id)
  File "/home/user/rebalance-lnd/lnd.py", line 142, in get_edge
    return self.stub.GetChanInfo(ln.ChanInfoRequest(chan_id=channel_id))
  File "/home/user/.local/lib/python3.9/site-packages/grpc/_channel.py", line 946, in __call__
    return _end_unary_response_blocking(state, call, False, None)
  File "/home/user/.local/lib/python3.9/site-packages/grpc/_channel.py", line 849, in _end_unary_response_blocking
    raise _InactiveRpcError(state)
grpc._channel._InactiveRpcError: <_InactiveRpcError of RPC that terminated with:
	status = StatusCode.UNKNOWN
	details = "edge not found"
	debug_error_string = "{"created":"@1642088005.995604515","description":"Error received from peer ipv4:127.0.0.1:10009","file":"src/core/lib/surface/call.cc","file_line":1063,"grpc_message":"edge not found","grpc_status":2}"
>