Fix potential nil pointer dereference #2578
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Summary
Currently, query container stats endpoint right after container starts trigger a panic (and as a result empty response for the endpoint), due to
taskStats.StatsQueue.GetLastStat()is nil when task just starts. This PR fixes it.Implementation details
Added nil pointer check.
Testing
Manually tested the mentioned case and verified the fix.
Description for the changelog
Bug - Fixed a bug that can cause stats endpoint to return empty response to container that just starts up.
Licensing
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.