Contenteditable rich text editor doesn't generate an error message when empty

My textarea doesn't generate an error message when empty. This is the textarea:

<textarea id="wmd-input" name="<?php echo $wmd_editor['name']; ?>"><?php echo $wmd_editor['content']; ?></textarea>

Code (markup):

It's passed like this in the post.php page:

    <?php

    if(richTextAllowed(time())) {
    $wmd_editor = array("name"=>"addesc", "content"=>$data['addesc']);
    include("{$path_escape}editor/wmd_editor.inc.php");
    } else {
    ?>

    <?php
    }
    ?>

Code (markup):

And the error is generated by:

    function checkPostFields(form) {
    var msg = '';
    var value_missing = false;
    if (form.elements['addesc'].value == ''
    || form.elements['adtitle'].value == ''
    || form.elements['email'].value == ''
    <?php if ($image_verification) { ?>
    || form.elements['captcha'].value == ''
    <?php } ?>
    ) {
    msg += '<?php echo $lang['ERROR_POST_FILL_ALL']; ?>\n';
    value_missing = true;
    }
    if (!form.elements['agree'].checked) {
    msg += '<?php echo $lang['ERROR_POST_AGREE_TERMS']; ?>\n';
    }
    <?php
    if(count($xsubcatfields)) {
    foreach($xsubcatfields as $fldnum=>$fld) {
    if ($fld['REQUIRED']) {
    ?>
    if (!value_missing && !form.elements['x[<?php echo $fldnum; ?>]'].value) {
    msg = '<?php echo $lang['ERROR_POST_FILL_ALL']; ?>\n' + msg;
    value_missing = true;
    }
    <?php
    }
    }
    }
    ?>
    if (msg != '') {
    alert(msg);
    return false;
    }
    }

Code (markup):

Everything works fine when I use just the textarea, but once the rich text editor's settings applied (contenteditable) the textarea allows to post messages even if there's no content in it.

 

Got it figured out. I got one line of code accidentally removed. Putting it back fixed it.