asciidoctor/asciidoctor-backends — pull request #106 by jirutka (2014-11-01 10:28:42+00:00)
Title: Fix inline_footnote – handle unresolved xref

To be consistent with the built-in version of the backend ([this line](https://github.com/asciidoctor/asciidoctor/blob/v1.5.1/lib/asciidoctor/converter/html5.rb#L997)).