Remove Media module tags from body field teaser

template.php

<?php

/**
 * Preprocess variables for node.tpl.php (and derivatives).
 *
 * Strips Media (media module) tags from teasers in article content.
 * Workaround until we have a filter: https://www.drupal.org/node/2165457
 */
function MYTHEME_preprocess_node(&$variables) {
  
  if ($node->type == 'article') {
    
    $content = $variables['content'];
    
    if (!empty($content['body'])) {
      if ($content['body']['#view_mode'] == 'teaser') {
        
        // Remove media tags.
        $doc = new DOMDocument();
        $doc->loadHTML($content['body'][0]['#markup'], LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
        $selector = new DOMXPath($doc);
        
        foreach ($selector->query('//div[contains(attribute::class, "media")]') as $e) {
          $e->parentNode->removeChild($e);
        }
        
        $variables['content']['body'][0]['#markup'] = $doc->saveHTML($doc->documentElement);
      }
    }
  }
}