Okay, I'v solved it.
I used – if(taxonomy_exixts('news') see code below.
<?php wp_nav_menu( array( 'container' => 'div', 'container_class' => 'main-nav', 'fallback_cb' => 'responsive_fallback_menu', 'theme_location' => 'header-menu' ) ); ?> <?php if(in_category('friends')) { wp_nav_menu( array( 'menu' => 'friends-menu', 'container' => '', 'fallback_cb' => false, 'menu_class' => 'sub-header-menu', ) ); } elseif(in_category('company-info')) { wp_nav_menu( array( 'menu' => 'company-info', 'container' => '', 'fallback_cb' => false, 'menu_class' => 'sub-header-menu', ) ); } elseif(in_category('resources')) { wp_nav_menu( array( 'menu' => 'resources', 'container' => '', 'fallback_cb' => false, 'menu_class' => 'sub-header-menu', ) ); } elseif(in_category('funky-guides-to')) { wp_nav_menu( array( 'menu' => 'funky-guides-menu', 'container' => '', 'fallback_cb' => false, 'menu_class' => 'sub-header-menu', ) ); } elseif(taxonomy_exists('news')) { wp_nav_menu( array( 'menu' => 'news-menu', 'container' => '', 'fallback_cb' => false, 'menu_class' => 'sub-header-menu', ) ); }?>