[php8-compat] Fix Include/Exclude Group Custom Search Tests by better… #20539
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… handling empty arrays on exclusions in the custom search
Overview
This fixes test failures such as https://test.civicrm.org/job/CiviCRM-Core-Edge/CIVIVER=master,label=test-3/lastCompletedBuild/testReport/(root)/CRM_Contact_Form_Search_Custom_GroupTest/testCount_with_data_set__1/
Before
CRM_Contact_Form_Search_Custom_GroupTest fails on php8
After
That test class works on php8
ping @eileenmcnaughton @totten @demeritcowboy @colemanw