[REF][PHP8.1] Fix issues in core extensions where passing in NULL val…

[seamuslee001]

…ues is no longer supported

Overview

Null values are passed into these parameters and in PHP8.1 this causes deprecation notices

Before

Null values passed in and deprecation notices triggered

After

Null values not used and deprecation notices are not triggered in this part of the code

ping @eileenmcnaughton @demeritcowboy @totten @colemanw

[civibot]

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