I am getting this error on this theme and I am trying to find out if the website even needs this set of code. It is a theme that doesn’t seem to have support. I contacted the support team and they acted like it was a different website all together, so I am trying to take the lead from here and see where I need to make changes to keep the theme up to date with professional standards. This is the error I am getting.

Notice: Undefined index: h in themes/dentario/fw/core/core.wp.php on line 1515

However, when I go to this file, it is fairly long, below is the code that is on this line, before and after.

    // Extract gallery, video and audio from full post content
    if (is_array($cached_post)) {
        $post_attachment    = $cached_post['post_attachment'];
    } else {
        $post_attachment = wp_get_attachment_url(get_post_thumbnail_id($post_id));
    }
    $post_thumb = $post_thumb_url = $post_gallery = $post_video = $post_video_image = $post_audio = $post_audio_image = $post_url = $post_url_target="";
    if (dentario_substr($opt['layout'], 0, 6)=='single')
        $post_thumb = dentario_get_resized_image_tag($post_id, $thumb_sizes['w'], $thumb_sizes['h'], null, false, false, true);
    else if (dentario_substr($opt['layout'], 0, 10)=='attachment')
        $post_thumb = dentario_get_resized_image_tag($post_attachment, $thumb_sizes['w'], $thumb_sizes['h'], null, false, false, true);
    else
        $post_thumb = dentario_get_resized_image_tag($post_id, $thumb_sizes['w'], $post_type=='product' && dentario_get_theme_option('crop_product_thumb')=='no' ? null :  $thumb_sizes['h']);
    $post_thumb_url = dentario_get_tag_attrib($post_thumb, '<img>', 'src');
    if ($post_format == 'gallery') {
        $post_gallery = dentario_build_gallery_tag(dentario_get_post_gallery($post_content_plain, $post_id, max(2, dentario_get_custom_option('gallery_max_slides'))), $thumb_sizes['w'], $thumb_sizes['h_crop'], false, $post_link);
    } else if ($post_format == 'video') {
        $src="";
        $post_video = dentario_get_post_video($post_content_original, false);
        if ($post_video=='') {
            $src = dentario_get_post_video($post_content_original, true);
        } else {
            if (dentario_substr($post_video, 0, 1)=='[') {
                $src = dentario_get_tag_attrib($post_video, '[trx_video]', 'src');
                if (empty($src)) $src = dentario_get_tag_attrib($post_video, '[trx_video]', 'url');
                if (empty($src)) $src = dentario_get_post_video($post_video, true);
                $post_video_image = dentario_get_tag_attrib($post_video, '[trx_video]', 'image');
                if ($post_video_image > 0) {
                    $attach = wp_get_attachment_image_src( $post_video_image, 'full' );
                    if (isset($attach[0]) && $attach[0]!='')
                        $post_video_image = $attach[0];
                }
                if (!is_singular() || dentario_storage_get('blog_streampage')) {
                    if (empty($post_video_image))
                        $post_video_image = $post_thumb;
                    if (empty($post_video_image))
                        $post_video_image = dentario_get_video_cover_image($src);
                }
                if (!empty($post_video_image))
                    $post_video_image = dentario_get_resized_image_tag($post_video_image, $thumb_sizes['w'], $thumb_sizes['h']);
            } else
                $src = dentario_get_post_video($post_video, true);
        }
        if ($src) {
            $src = dentario_get_video_player_url($src, $post_thumb!='' || $post_video_image!='');
            $post_video = '<video src="'.esc_url($src).'" width="'.esc_attr($thumb_sizes['w']).'" height="'.round($thumb_sizes['w']/16*9).'"></video>';
        }
        if ($post_video!='' && $opt['substitute_video']) {  
            $post_video = dentario_substitute_video($post_video, $thumb_sizes['w'], round($thumb_sizes['w']/16*9), false);  
        }
    } else if ($post_format == 'audio') {
        $src = $data="";
        $post_audio = dentario_get_post_audio($post_content_original, false);
        if ($post_audio=='') {
            $src = dentario_get_post_audio($post_content_original, true);
        } else {
            if (dentario_substr($post_audio, 0, 1)=='[') {
                $src = dentario_get_tag_attrib($post_audio, '[trx_audio]', 'src');
                if (empty($src)) $src = dentario_get_tag_attrib($post_audio, '[trx_audio]', 'url');
                if (empty($src)) $src = dentario_get_post_audio($post_audio, true);
                $post_audio_image = dentario_get_tag_attrib($post_audio, '[trx_audio]', 'image');
                if ($post_audio_image > 0) {
                    $attach = wp_get_attachment_image_src( $post_audio_image, 'full' );
                    if (isset($attach[0]) && $attach[0]!='')
                        $post_audio_image = $attach[0];
                }
                if (empty($post_audio_image))
                    $post_audio_image = $post_thumb;
                if ($post_audio_image)
                    $post_audio_image = dentario_get_resized_image_url($post_audio_image, $thumb_sizes['w'], $thumb_sizes['h']);
                $post_audio_title  = dentario_get_tag_attrib($post_audio, '[trx_audio]', 'title');
                $post_audio_author = dentario_get_tag_attrib($post_audio, '[trx_audio]', 'author');
                $data = ($post_audio_title != ''  ? ' data-title="'.esc_attr($post_audio_title).'"'   : '')
                       .($post_audio_author != '' ? ' data-author="'.esc_attr($post_audio_author).'"' : '')
                       .($post_audio_image != ''  ? ' data-image="'.esc_attr($post_audio_image).'"'   : '');
            } else
                $src = dentario_get_post_audio($post_audio, true);
        }
        if ($src) {
            $post_audio = '<audio class="sc_audio" src="'.esc_url($src).'"'
                . ($data)
                . '></audio>';
        }
        if ($post_audio!='' && $opt['substitute_audio']) {  
            $post_audio = dentario_substitute_audio($post_audio, false);
        }
    }
    if ($post_format == 'image' && !$post_thumb && !is_single()) {
        if (($src = dentario_get_post_image($post_content_original, $post_id))!='')
            $post_thumb = dentario_get_resized_image_tag($src, $thumb_sizes['w'], $thumb_sizes['h_crop']);
    }
    if ($post_format == 'link') {
        $post_url_data = dentario_get_post_link($post_content_original, false);
        $post_url_target = $post_url_data['target'];
    }

I guess part of my question is, do even need this code above? I am trying to make the theme lighter, and it seems like a lot of code was put in this theme to cater to everyone. I would like to focus it more on the one business I am working with. Any way I can remove this error? and do I even need this chunk of code above?