I thought that excessive blank lines had been sorted
@jaread83 - Well this works for me.
<html>
<head>
<meta content="text/html;charset=utf-8" http-equiv="Content-Type">
<meta content="utf-8" http-equiv="encoding">
<title>Test</title>
<style>
.lia-message-body-content {
background-color:red;
border:1px solid black ;
font-size: 18px;
}
</style>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js">
</script>
<script>
$(document).ready(function() {
$(".lia-message-body-content").each(function() {
$($("p").get().reverse()).each(function() {
var $this = $(this);
if ($this.html().replace(/\s| /g, '').length == 0) {
$this.remove();
}
else {
return false;
}
});
});
});
</script>
</head>
<body>
<div class="lia-message-body-content">
<p>Blah</p>
<p> </p>
<p> </p>
<p>Another Paragraph I want to keep</p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
</div>
</body>
</html>
So as to why is doesn't work for you then, I don't know But you might want to fix the return false statement and put it after the console.log('stop') as that is unreachable.
I shall go and play 
@Anonymous wrote:
Glad to see it's all working now, but are you going to install it?
Moderator's note by Adie (Dvorak) removed excessive white space.
Of course the space was put there for testing! 
I've thanked your post above and will just test the fix out here ..... and then edit the post after to tidy up anything that needs to be.
Well I put loads of blank lines at the end of the post which got successfully removed from the "posted" post. I've left some above to show they correctly remain.
@jaread83 wrote:
Just going through the threads that were mentioned in the latest update thread.
A fix for this issue will be pushed live today, you can view details of the fix on the update thread here. See the second and third item on the 'regular changes' section.
Above, I've now quoted part of your post and put some extra blank lines within the quote which should remain, and put some at the end which should get removed
And that all seems to work perfectly as expected, so another one for @Oldjim to hopefully mark your post above as a fix 