If teaser has no HTML, cannot be inserted inline

When the teaser has no HTML, then the check to insert it inline fails forcing it to be inserted after. Below is an example of a fix for it by adding an additional check.

read_more_node_view():

<?php
      // Get last position of the last closing marker in teaser.
      if (isset($node->content['body'][0]['#markup']) && preg_match('!</?' . $elements . '[^>]*>\s*$!i', $node->content['body'][0]['#markup'], $match, PREG_OFFSET_CAPTURE)) {
        // Recalculate the position in $teaser. We do this because there may be extra CCK fields appended to the teaser.
        $insert_point = strpos($view_mode, $node->content['body'][0]['#markup']) + $match[0][1];
        // Insert the link.
        $node->content['body'][0]['#markup'] = substr_replace($node->content['body'][0]['#markup'], drupal_render($read_more_link), $insert_point, 0);
      // In case there is no HTML markup
      } elseif(isset($node->content['body'][0]['#markup']) && strip_tags($node->content['body'][0]['#markup']) == $node->content['body'][0]['#markup']) {
        $node->content['body'][0]['#markup'] = rtrim($node->content['body'][0]['#markup']) . drupal_render($read_more_link);
      } else {
        $display = 'after';
      }
?>