Support "list-style: none" CSS

[michaelrsweet]

Version: 1.9-current
Original reporter:

Many applications and HTML designs contain the following
list style in CSS:

or

It should simply omit the bullet in a list.

It is currently is not supported by HTMLDOC, as a result the
whole PDF generation is failed.

[michaelrsweet]

Original reporter: Michael Sweet

Fixed in Subversion repository.