Images in old posts not displayed

[yari]

post:

![simple.jpg](/uploads/files/1487437791358-simple.jpg) 

test canım

output:

<div class="content" component="post/content" itemprop="text">
	<p></p>
<p>test canım</p>
</div>

repro: latest master
https://github.com/NodeBB/NodeBB/commit/f302c0d739472417c04aead83729b41d3b807fd8

[PitaJ]

@yari https://github.com/NodeBB/NodeBB/issues/5441