beautify-html returns null on broken html

[eleith]

the following html when passed into beautify-html

<img title="Image: https://spark-public.s3.amazonaws.com/maps/images/Headers/MapHeader9.jpg" src="https://spark-public.s3.amazonaws.com/maps/images/Headers/MapHeader9.jpg" alt="Flickr photo showing instructor's personal map." "photo="" credit:="" "anthony="" c.="" robinson"="" height="376" width="850">

returns null. i know the html is mal-formed but my expectation is that it just gives me back the string as is, to avoid data loss. we have a simple workaround, but thought i would file my findings in case others run into this.