WordPress Custom Post query else data - php

Question

I recently developed a Wordpress theme, this theme has little bit complex custom post type.
Below is my custom post query code. I would like kind of a else content whenever the request doesn't return any post. Its currently just blank.
I am not a PHP developer though, would someone give me a hand adding such a alternative content ?
Thank you.
<div class="front_page_deal_holder">
<?php
// get the currently queried taxonomy term, for use later in the template file
$term = get_queried_object();
//second query - posts
// Define the query
$args = array(
'post_type' => 'products',
'product_cat' => $term->slug
);
$query = new WP_Query( $args );
if ($query->have_posts()) {
// output the term name in a heading tag
echo'<h1>All Products about '. $term->name . '</h1>';
echo'<div class="row">';
// Start the Loop
while ( $query->have_posts() ) : $query->the_post(); ?>
<div class="col-lg-3">
<a style="display:block;text-decoration:none" href="<?php the_permalink(); ?>">
<div class="single_front_sec">
<?php $featured_img_url = get_the_post_thumbnail_url(get_the_ID(),'post-image'); ?>
<img class="post_thumb_cus" src="<?php echo $featured_img_url ?>" alt="Product Image">
<h2 class="featured_product_heading">
<?php the_title(); ?>
</h2>
<span class="offer_note"><p><?php echo get_post_meta($post->ID, 'Offer Note', true); ?></p></span>
<div class="vew_d_button_holder">
<a class="view_d_button" href="<?php the_permalink(); ?>">View Details</a>
</div>
</div>
</a>
</div>
<?php endwhile; ?>
</div>
<!-- row -->
<div class="my_Custom_pagination">
<?php wp_pagenavi( array( 'query' => $query ) ); ?>
</div>
<?php } // end of check for query having posts
// use reset postdata to restore orginal query
wp_reset_postdata();
?>
<?php include_once('top-categories.php'); ?>
<!--==== Top catogory section ====-->
<!-- front deal closed -->
</div>

Answer 1

elseif(!$query->have_posts()){//HTML here}
or
else{ //HTML here}
right after the end of check for your query , if you want to follow an OOP rule to make your code cleaner , move everything into a function inside function.php file and call the function there instead

Answer 2

<div class="front_page_deal_holder">
<?php
// get the currently queried taxonomy term, for use later in the template file
$term = get_queried_object();
$args = array(
'post_type' => 'products',
'product_cat' => $term->slug
);
$query = new WP_Query( $args );
if ($query->have_posts()) {
echo'<h1>All Products about '. $term->name . '</h1>';
echo'<div class="row">';
while ( $query->have_posts() ) : $query->the_post(); ?>
<div class="col-lg-3">
<a style="display:block;text-decoration:none" href="<?php the_permalink(); ?>">
<div class="single_front_sec">
<?php $featured_img_url = get_the_post_thumbnail_url(get_the_ID(),'post-image'); ?>
<img class="post_thumb_cus" src="<?php echo $featured_img_url ?>" alt="Product Image">
<h2 class="featured_product_heading">
<?php the_title(); ?>
</h2>
<span class="offer_note"><p><?php echo get_post_meta($post->ID, 'Offer Note', true); ?></p></span>
<div class="vew_d_button_holder">
<a class="view_d_button" href="<?php the_permalink(); ?>">View Details</a>
</div>
</div>
</a>
</div>
<?php endwhile; ?>
</div>
<div class="my_Custom_pagination">
<?php wp_pagenavi( array( 'query' => $query ) ); ?>
</div>
<?php }else{
// Add your code here for else part
}
wp_reset_postdata();
?>
<?php include_once('top-categories.php'); ?>
</div>