Don't fail when anchors are incomplete
Don't fail when anchors are incomplete

If you manually add an anchor tag to a document, such as an internal
target for another link, then we previously crashed when trying to parse
it. Now we skip it as we should.

Fixes #697

puppetlabs/showoff,marrero984/showoff,binford2k/showoff,binford2k/showoff,binford2k/showoff,marrero984/showoff,marrero984/showoff,puppetlabs/showoff,marrero984/showoff,puppetlabs/showoff,puppetlabs/showoff,binford2k/showoff