Portfolio page not displaying posts

<?php
/*
    Template name:Portfolio Page
*/
?>
<?php get_header(); ?>

<section class="row">
  <div class="small-12 columns text-center">
    <div class="leader">

    <?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>

      <h1><?php the_title(); ?></h1>
      <?php the_content(); ?>      

    <?php endwhile; endif; ?>

    </div>
  </div>
</section>


<?php 

  $num_posts = ( is_front_page() ) ? 4 : -1;

  $args = array(
    'post_type' => 'portfolio',
    'posts_per_page' => $num_posts
  );
  $query = new WP_Query( $args );

?>


<section class="row no-max pad">

  <?php if( $query->have_posts() ) : while( $query->have_posts() ) : $query->the_post(); ?>

  <div class="small-6 medium-4 large-3 columns grid-item">
    <a href="<?php the_permalink(); ?>"><?php the_post_thumbnail('large'); ?></a>
  </div>

  <?php endwhile; endif; wp_reset_postdata(); ?>

</section>