docker_client: Add missing error handling in getContainerStatsNotStre… #2757
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Summary
This PR potentially fixes flaky test TestStatsEngineWithNewContainersWithPolling. We currently don't handle when ContainerStats() returns error which leads to nil pointer dereference.
This PR is a copy of #2751 which was wrongly merged to a
ecs_execfeature branch.Implementation details
Testing
make testsucceedsNew tests cover the changes: yes
Description for the changelog
Bug - Add missing error handling in getContainerStatsNotStreamed
Licensing
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.