Delete obsolete directories after purging the backups from mdl_files

[abias]

After purging the backups, there are obsolete directory entries left in mdl_files.

You might want to add something like that after line https://github.com/UniversidadORT/moodle-tool_autobackups/blob/master/cli/purge_autobackups.php#L89:

$sql2 = 'select id, contextid, itemid, filepath, filename 

from {files}
where component = \'backup\' and filearea = \'automated\' and filename = \'.\';';

$sth2 = $DB -> get_records_sql($sql2);

foreach ($sth2 as $id => $row) {
        $file = $fs -> get_file($row -> contextid, 'backup', 'automated', $row -> itemid, $row -> filepath, $row -> filename);
        if ($file) { // file found

                if (array_key_exists('c', $options) || array_key_exists('x', $options)) {
                        // Delete directory
                        if ( $file -> delete() ) {
                                echo 'Directory sent to trash:    ' . $file -> get_filename() . "\n";
                        } else {
                                echo 'Could not delete directory: ' . $file -> get_filename() . "\n";
                        }
                }
        }
}

Cheers,
Alex