Find This code
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if (tep_not_null($action)) {
switch ($action) {
case 'save':
reset($HTTP_POST_VARS['configuration']);
while (list($key, $value) = each($HTTP_POST_VARS['configuration'])) {
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INSERT THE FOLLOWING CODE AFTER THE ABOVE LINE:
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if (is_array($value) ) {
$value = implode( ", ", $value);
$value = preg_replace ("/, --none--/", "", $value);
}