<div class="row wrapper">
  <div class='news'>
  <?php
    $result = mysqli_query($connection, "SELECT * FROM `articles` ORDER BY `articles`.`id` DESC") or die(mysql_error());
    $data = mysqli_fetch_array($result);
    do {
        if(empty($data["img"]))
        {
            printf("
              <div class='col-sm-8 ns_c'>
                <img src='http://image.ibb.co/fxjQvw/No_Image_Available.png'>
                <h2 class='title'>%s</h2>
                <p class='blogg'>%s</p>
              </div>
            ", $data["title"], $data["text_p"], $data["id"]);
        }else{
            printf("
              <div class='col-sm-8 ns_c'>
                <img src='%s'>
                <h2 class='title'>%s</h2>
                <p class='blogg'>%s</p>
              </div>
            ",$data["img"], $data["title"], $data["text_p"]);
        }
    }
    while($data = mysqli_fetch_array($result));
  ?>
  </div>
  <aside class="col-sm-3 ml-sm-auto blog-sidebar ">
    <div class="sidebar-module mainsidebar">
      <h4 class='title_s'>Категории</h4>
      <ol class="list-unstyled">
        <li><a href="#">CSS</a></li>
        <li><a href="#">jQuery</a></li>
      </ol>
    </div>
    <div class="sidebar-module mainsidebar">
    <h4 class='title_s'>Интересное</h4>
      <ol class="list-unstyled">
        <li><a href="#">Здесь будут интересные материалы</a></li>
      </ol>
    </div>
    <div class="sidebar-module mainsidebar">
    <h4 class='title_s'>Статистика</h4>
      <ol class="list-unstyled">
        <li><a href="#">Статистика посещений</a></li>
      </ol>
    </div>
  </aside><!-- /.blog-sidebar -->
</div><!-- /.row -->