don't render fb:app_id if inputbox is empty

Hi,

Your plugin is great for comments, however I’m using several social plugins, and this creates duplicate og tags issue.

Would you kindly add some logic to not output `<meta content=”” property=”fb:app_id”>’ when the FB app id input is empty?

With my limited php knowledge I managed to do this myself though I’m not sure it’s the proper way to do it:

public function generete_front_javascript(){
    wp_enqueue_script('thickbox');
    wp_enqueue_style('thickbox');
    if(!empty($this->params['wpdevart_comment_facebook_app_id'])) {
        echo '<meta property="fb:app_id" content="'.$this->params['wpdevart_comment_facebook_app_id'].'"/>';
    }
}

Thanks!!

https://www.ads-software.com/plugins/comments-from-facebook/