Fix deprecated PHP 8.x passing null to strlen #222
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Since php 8.0 it has been deprecated to pass null as parameter to strlen.
When there are empty parameters in the querystring, this warning occurs:
strlen(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/vendor/kyslik/column-sortable/src/ColumnSortable/SortableLink.php on line 251
This PR fixes this issue.