PHP 8.1 Deprecated function: str_replace(): Passing null to parameter [#3396444]

Problem/Motivation

Upgrading to PHP 8.1 ran into these.

    Deprecated function: str_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in template_preprocess_date_views_pager() (line 88 of /var/www/html/public/sites/all/modules/contrib/date/date_views/theme/theme.inc).
    Deprecated function: str_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in template_preprocess_date_views_pager() (line 102 of /var/www/html/public/sites/all/modules/contrib/date/date_views/theme/theme.inc).

Steps to reproduce

Proposed resolution

Cast $subject to a string.

Remaining tasks

User interface changes

API changes

Data model changes

Issue fork date-3396444

Show commands

Start within a Git clone of the project using the version control instructions.

Add & fetch this issue fork’s repository

Or, if you do not have SSH keys set up on git.drupalcode.org:

Add & fetch this issue fork’s repository

3396444-1 changes, plain diff MR !26
Check out this branch for the first time

Check out existing branch, if you already have it locally
3396444-php-8.1-deprecated changes, plain diff MR !25
Check out this branch for the first time

Check out existing branch, if you already have it locally