ImageServing: Thumbnail image not appearing in latest news articles

@Wikia/platform-team

This regression was caused by PLATFORM-285. Video (or any other image) that was used only on a single blog post (i.e. outside content namespace) was not added to the list of images with popularity score (calculated only for images used on content namespaces) and as a result not added to the list of images suggested for a given article.

PLATFORM-358
This is odd. Won't this affect the rest of the request? If we need to do stuff like this I think it should be wrapped in a way that will ensure that the state is restored safely and it's clear to the reader what is happening. Something like:

```PHP
$im = MemecacheLib::noCaching(function use ($title) () {
   return ImageServing( array( $title->getArticleID() ), 32, 32 );
}
```