Terminate without submission on error/no result

[lladdy]

I suspect that this line is creating init error results when we scale down workloads in rancher:

aiarena-client/arenaclient/client.py

Line 444 in 3becbf6

if not result.has_result():

I suspect that, when we scale down an AC workload in rancher, it terminates the docker container and the rust component of the AC might be terminated first, resulting in an null result in the python AC code, which causes the above code to report an init error.

Suggestion:

• Don't submit result in error scenarios
  Instead rely on other mechanisms (such as logging errors in rancher) to report AC issues.
• Detect SIGTERM and gracefully shutdown
  https://stackoverflow.com/questions/18499497/how-to-process-sigterm-signal-gracefully