Module doesn't properly check if data exists

'similarterms 7.x-1.x-dev (2010-Aug-04)' — to be precise!

... no [good] news here?

Oh, what a pitty: 'Similar By Terms 7.x-1.x-dev (2011-Feb-25)' does not solve any of the described errors above.

There is still (on views, /node* & /user*):

# Notice: Undefined index: render element in theme() (line 811 of /var/www/testli/includes/theme.inc).
# Notice: Undefined variable: items in include() (line 14 of /var/www/testli/sites/all/modules/similarterms/similarterms.tpl.php).

And (on e.g. '/admin/modules' or '/admin/structure/block'):

* Notice: Undefined property: stdClass::$multiple in similarterms_block_info() (line 64 of /var/www/testli/sites/all/modules/similarterms/similarterms.module).
* Notice: Undefined property: stdClass::$tags in similarterms_block_info() (line 64 of /var/www/testli/sites/all/modules/similarterms/similarterms.module).
* Notice: Undefined property: stdClass::$multiple in similarterms_block_info() (line 64 of /var/www/testli/sites/all/modules/similarterms/similarterms.module).
* Notice: Undefined property: stdClass::$tags in similarterms_block_info() (line 64 of /var/www/testli/sites/all/modules/similarterms/similarterms.module).

A brief and superficial look into 'similarterms.tpl.php' reveals quite clearly the culprit: it is the $items array. But there is no quick fix for that, cause even a modification of line#14 into if (is_array($items) ) { doesn't solve the problem. Since I am not a maintainer of this module and I am lacking in time, I need to give up here -- sorry! Below the mentioned code:

<?php
if ($items) {
$items_ls = array();
  if ($display_options == 'title_only') {
    foreach ($items as $node) {
      $items_ls[] = l($node->title, 'node/'. $node->nid);
    }
    print theme('item_list', $items_ls);
  }
  if ($display_options == 'teaser') {
    $output = '';
    foreach ($items as $node) {
      $output .= '<li>'. l($node->title, 'node/'. $node->nid);
      $output .= ' - '. $node->teaser;
      $output .= "</li>\n";
    }
    if ($output) {
      echo "<ul>" . $output . "</ul>";
    }
  }
}
?>

... this function is from 'similarterms.module'. It is the one which creates the $items array. Maybe someone can find the flaw by briefly having a look at the code?:

<?php
function  similarterms_menu() {
  // Admin settings for the site.
  $items['admin/settings/similarterms'] = array(
    'title' => 'Similar By Terms',
    'description' => 'Basic Settings for similar term most settings are in the blocks config.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('similarterms_admin_settings'),
    'file' => 'similarterms.admin.inc',
    'access arguments' => array('administer site configuration'),
    'type' => MENU_NORMAL_ITEM, // optional
  );
  return $items;
}
?>

... indicate the error for the most current module version -- please don't change this setting [back in time]!