Fix incorrect log formatting of variables_override without exceptions

Martin Cavojrequested to merge
541922-variables-override-fix-empty-exceptions-in-logs into master

What does this MR do and why?

Fix incorrect log formatting of variables_override without exceptions

When exceptions are an empty array, we don't need to expose it in the API. If we do, runner logs "except for" and leads to incorrect formatting.

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Related to #541922 (closed)

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