dbowen/NSAttributedString-DDHTML — pull request #2 by mciuba (2014-02-06 18:00:07+00:00)
Title: fixed crash when <font> tag with unavailable font name is present

It is possible that HTML contains tag `` and the font with the given name is not available (`fontWithName:size:` returns `nil`). In such a case we will try to set `NSFontAttributeName` with nil `value`, which results in a crash. It can be simply fixed by using `systemFontOfSize:` when `fontWithName:size:` returns `nil`.