Empty string setFont fix
Merge pull request #5 from ziryanov/master fixed [https://github.com/evermeer/AttributedTextView/issues/4] and [https://github.com/evermeer/AttributedTextView/issues/6]
Merge pull request #5 from ziryanov/master fixed [https://github.com/evermeer/AttributedTextView/issues/4] and [https://github.com/evermeer/AttributedTextView/issues/6]