Warning: Undefined array key "audience" in Drupal\facets_summary\FacetsSummaryManager\DefaultFacetsSummaryManager->build()

$show_count is returning null, hence modified with conditions and adding a patch.
This patch resolves above warning.

I reviewed and tested patch #2 → applied and working fine for me.

I can also confirm that patch fixes the issue. :-)

I think this solution is not the most readable, it can be rewritten to be clearer. It should also come with a test where we can prove this issue is actually fixed.