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$i = 0;
if ($query->have_posts()) : while ($query->have_posts()) : $query->the_post(); ?>

		<?php  if ( $i % 2 ==  0) { ?>
        <div class="col_half nobottommargin">
    <?php } ?>


		//the post data


    <?php if ( $i % 2 != 0 ) { ?>
        </div>
    <?php } ?>

<?php $i++; endwhile; // End Loop. ?>

    <!-- added closing </div> for odd number of posts -->
    <?php if ( $i % 2 != 0 ) {?>
        </div>
    <?php } ?>

<?php endif;  wp_reset_postdata();  ?>