Fix HtmlSanitizer to return cleaned string in proper encoding.
Fix HtmlSanitizer to return cleaned string in proper encoding.

This fix prevent HtmlSanitizer from throwing UnicodeDecodeError exception.

MatthewWilkes/mw4068-packaging,MatthewWilkes/mw4068-packaging,MatthewWilkes/mw4068-packaging,MatthewWilkes/mw4068-packaging