View difference between Paste ID: YdE0VvwT and dtn8T43f

 <?php
 
 get_header(); ?>
 
 <div id="primary">
 <div id="content" role="main">
 
 <?php
 /* Set up an array to hold the ids for the categories we want to pull from
 * The order in which the posts are called & displayed is goverened by their
 * placement in this array
 */
-$my_cat_array = array(5,3,22,1); //adjust ids to match your current site
+$my_cat_array = array(6613,113,999,1123); //adjust ids to match your current site
 
 /*
 * Set up a flag that will indicate if we've returned ANY posts from any of the chosen categories
 * As we don't have access to the standard Loop 404, we'll need this in case we
 * bomb out on all categories. This kind of post counter can come in useful elsewhere...
 */
 $posts_count = 0;
 
 /*
 * Rather than modify the main Loop, we'll use get_posts to create 3 secondary loops that grab * the first post from each of these categories. This has the benefit of leaving the main Loop * untouched if you want to call it later on in the page.
 */
 $cat_posts = array(); //an array to collect the post ids of the one post per category//
 
 foreach ( $my_cat_array as $my_cat) :
 
 // Set up the secondary loop query
 $args = array(
 	'numberposts' => 1, // number of posts to return
 	'category__in' => array($my_cat), // the category id
 	'post__not_in' => $cat_posts // avoid duplicates
 );
 $lastpost = get_posts($args);
 
 // If we have at least 1 post, increment the post_counts flag
 if( count( $lastpost ) > 0 ) $posts_count++;
 
 // We still have to run a foreach Loop - even if there's only 1 post.
 foreach($lastpost as $post) :
 $cat_posts[] = $post->ID; //'remember' the post ID
 endforeach;
 // Move onto the next post in the category array
 
 endforeach;
 // We've finished the category array!
 
 // build a secondary loop with the post IDs from the category posts
 
 $args = array(
 'post__in' => $cat_posts,
 'orderby' => 'date',
 'order' => 'DESC',
 'ignore_sticky_posts' => 1
  );
 $cat_loop = new WP_Query( $args );
 
-if( $cat_loop->have_posts() ) : while( $cat_loop->have_posts() ) : $cat_loop->the_post();
+if( $cat_posts && $cat_loop->have_posts() ) : while( $cat_loop->have_posts() ) : $cat_loop->the_post();
 // Now we can display the post using all of the standard Loop tags
 ?>
 <div id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
 <h2 class="entry-title"><a href="<?php the_permalink(); ?>" title="<?php printf( esc_attr__( 'Permalink to %s', 'twentyeleven' ), the_title_attribute( 'echo=0' ) ); ?>" rel="bookmark"><?php the_title(); ?></a></h2>
 
 <div class="entry-content">
 <?php the_content( __( 'Continue reading <span class="meta-nav">&rarr;</span>', 'twentyeleven' ) ); ?>
 <?php wp_link_pages( array( 'before' => '<div class="page-link">' . __( 'Pages:', 'twentyeleven' ), 'after' => '</div>' ) ); ?>
 </div><!-- .entry-content -->
 
 <div class="entry-utility">
 <?php if ( count( get_the_category() ) ) : ?>
 <span class="cat-links">
 <?php printf( __( '<span class="%1$s">Posted in</span> %2$s', 'twentyeleven' ), 'entry-utility-prep entry-utility-prep-cat-links', get_the_category_list( ', ' ) ); ?>
 </span>
 <span class="meta-sep">|</span>
 <?php endif; ?>
 <?php
 $tags_list = get_the_tag_list( '', ', ' );
 if ( $tags_list ):
 ?>
 <span class="tag-links">
 <?php printf( __( '<span class="%1$s">Tagged</span> %2$s', 'twentyeleven' ), 'entry-utility-prep entry-utility-prep-tag-links', $tags_list ); ?>
 </span>
 <span class="meta-sep">|</span>
 <?php endif; ?>
 <span class="comments-link"><?php comments_popup_link( __( 'Leave a comment', 'twentyeleven' ), __( '1 Comment', 'twentyeleven' ), __( '% Comments', 'twentyeleven' ) ); ?></span>
 <?php edit_post_link( __( 'Edit', 'twentyeleven' ), '<span class="meta-sep">|</span> <span class="edit-link">', '</span>' ); ?>
 </div><!-- .entry-utility -->
 </div><!-- #post-## -->
 
-<?php endwhile;
+<?php endwhile; wp_reset_postdata();
 
 // We now need to check that we did manage to display at least 1 post
 
 else :
 // Uh oh - we didn't display any posts! ?>
 <div id="post-0" class="post error404 not-found">
 <h1 class="entry-title"><?php _e( 'Not Found', 'twentyeleven' ); ?></h1>
 <div class="entry-content">
 <p><?php _e( 'Apologies, but no results were found for the requested archive. Perhaps searching will help find a related post.', 'twentyeleven' ); ?></p>
 <?php get_search_form(); ?>
 </div><!-- .entry-content -->
 </div><!-- #post-0 -->
 <?php endif;?>
 
 </div><!-- #content -->
 </div><!-- #primary -->
 
 <?php get_sidebar(); ?>
-<?php get_footer(); ?>
+<?php get_footer();