Deprecated function: trim(): Passing null to parameter #1 ($string) of type string is deprecated in block_exclude_pages_block_access() [#3257452]

Problem/Motivation

Deprecated function: trim(): Passing null to parameter #1 ($string) of type string is deprecated in block_exclude_pages_block_access() (line 57 of modules/contrib/block_exclude_pages/block_exclude_pages.module).

Steps to reproduce

* Install module on site running on PHP 8.1.

Proposed resolution

Resolve deprecation.

Issue fork block_exclude_pages-3257452

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