Fix php warnings

Thanks for useful plugin! I fix some PHP warnings that appeared in the admin panel – 92a93,94 > if ($media_custom_fields) { > foreach ( $media_custom_fields as $custom_field ) { 94,100c96,100 < foreach ( $media_custom_fields as $custom_field ) { < < $form_fields[ $custom_field['unique_id'] ] = array( < 'label' => $custom_field['name'] , < 'value' => get_post_meta( $post->ID, '_' . $custom_field['unique_id'] , true ), < 'helps' => $custom_field['help'] < ); --- > $form_fields[ $custom_field['unique_id'] ] = array( > 'label' => $custom_field['name'] , > 'value' => get_post_meta( $post->ID, '_' . $custom_field['unique_id'] , true ), > 'helps' => $custom_field['help'] > ); 101a102 > } 200c201 < if ( ( $_GET['delete'] ) ) { --- > if ( isset( $_GET['delete'] ) ) { 241c242 < <?php $index_count++;} ?> --- > <?php } ?> https://wordpress.org/plugins/add-custom-fields-to-media/