Non-array (or null) parameter passed to `source_link()`

[GwynethLlewelyn]

I'm getting the following error on Version 2010.0207 of this plugin, using FeedWordPress 2022.0222, running under PHP 8.2.10:

PHP Warning:  Uninitialized string offset 0 in /my/path/wp-content/plugins/add-attribution-feedwordpress/add-attribution-feedwordpress.php on line 268

This is essentially source_link() getting passed a null, or a zero, or worse

On line 268, just below the function source_link( $atts ) declaration, just add:

        if ( empty( $atts ) or ! is_array( $atts ) or empty( $atts[0] ) ) :
            return NULL;
        endif;

just before the switch.

This won't fix the issue, but at least stops PHP from complaining with a warning.