fix: Test command line result before comparing it to Gunicorn master name

[dax]

What does this PR do?

It tests the result of psutil.cmdline() before comparing its first element to the Gunicorn master process name.

Motivation

On Linux psutil.cmdline() may return an empty array (e.g. for kernel processes) making cmdline()[0] crash with an IndexError: list index out of range error.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.63%. Comparing base (642b2f9) to head (f3228c0).

Additional details and impacted files

Flag	Coverage Δ
activemq	?
cassandra	?
gunicorn	91.41% <100.00%> (-0.75%)	⬇️
hive	?
hivemq	?
hudi	?
ignite	?
jboss_wildfly	?
kafka	?
presto	?
solr	?

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