Suppress error in end_run when called from atexit

[harupy]

Related Issues/PRs

#xxx

What changes are proposed in this pull request?

When end_run is called from atexit, there is no guarantee that the run's experiment still exists. If the experiment has been already removed, end_run fails. This PR fixes it.

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• Existing unit/integration tests
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• Manual tests (describe details, including test results, below)

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[BenWilson2]

LGTM

[WeichenXu123]

I have a question, on databricks runtime, atexit hook does not work, in this case, any consequence if the run is not ended when databricks notebook is detached ?

[harupy]

@WeichenXu123

1. start a run
2. detach the notebook

This shoudl leave the run unfinished.