test fixup- changed fn signature doesn't expect 'NULL'

tests/phpunit/CiviTest/CiviUnitTestCase.php

tests/phpunit/api/v3/EntityTagTest.php

tests/phpunit/api/v3/EventTest.php

tests/phpunit/api/v3/GroupContactTest.php

tests/phpunit/api/v3/MembershipPaymentTest.php

tests/phpunit/api/v3/MembershipTest.php

tests/phpunit/api/v3/ParticipantPaymentTest.php

tests/phpunit/api/v3/ParticipantTest.php

tests/phpunit/api/v3/PledgePaymentTest.php

tests/phpunit/api/v3/PledgeTest.php

tests/phpunit/api/v3/RelationshipTest.php

tests/phpunit/api/v3/RelationshipTypeTest.php