function buddydev_add_default_category_to_post( $post_id ) {

	$tax = array_filter( $_POST['tax_input'] );

	if( empty( $tax ) && $post_id ) {
		//no category was set
		$term = 79;//ID
		wp_set_object_terms( $post_id, $term, 'category' );

	}


}

function buddyblog_show_custom_cats( $settings ) {
	$tax = array();

	$tax['category'] = array(

		'taxonomy'		=> 'category',
		'view_type'		=> 'dd',
		'child_of'		=> 91, //CHAGE It with the correct ID,
		'orderby'		=> 'slug',
		'order'			=> 'ASC'
	);

	$settings['tax'] = $tax;

	return $settings;
	}