This is a small change to prevent an unnecessary query from being executed when calling syncWithoutDetaching with an empty value or collection (collect(), [], or null).

Without this, we have to check every time to ensure the values are present instead of the framework automatically handling this. Over time, this can reduce a lot of conditions from being created unnecessarily, as well as SQL queries.

Before:

if ($tags->isNotEmpty()) {
    $post->tags()->syncWithoutDetaching($tags);
}

After:

$post->tags()->syncWithoutDetaching($tags);