I'm running a mysqli query.

this is my code

<?php
    $SM_pro_info="SELECT * FROM special_marketing_ads ORDER BY id desc LIMIT 4";
    $QSM_pro_info = $db->query($SM_pro_info)or die($db->error);
        if($QSM_pro_info->num_rows ==1){
        while($SM_pro=$QSM_pro_info->fetch_object()){   
    ?>
      <table width="208" border="0">
        <tr>
          <td width="129" height="35" align="right"><span style="color:#361800; font-size:14px; font-weight:bold;"><?php echo $SM_pro->pro_title; ?></span></td>
          <td width="69" rowspan="2" align="center"><a rel="lightbox" href="includes/Cpanel/projectImages//images.jpg" ><img src="<?php echo $SM_pro->image_1; ?>" alt="" width="60" height="60" border="0" /></a></td>
        </tr>
        <tr align="right">
          <td><span style="color:#361800; font-size:14px; font-weight:bold;">?????</span> : <span style="color:#da6e19; font-size:15px; font-weight:bold;"><?php echo $SM_pro->pro_purpose; ?></span></td>
        </tr>
      </table>
      <?php
        }
        }else{
            echo"Your Ads here";
            }
      ?>

now all I want to do is if there is any results comeing from mysqli echo it if there is no results it should echo an image which is add your ads here. the point is I have 4 Ads so if there is 1 Ads in mysqli row and the others is empty so I want it to echo this single Ads and the other 3 Ads should be this image add your Ads here. any Help on this please?