Fixed a bug which prevented an empty mapping from being used as a simple key (#150, thank to spitzak(at)rhythm(dot)com).
Fixed a bug which prevented an empty mapping from being used as a simple key (#150, thank to spitzak(at)rhythm(dot)com).

sigmavirus24/libyaml,sigmavirus24/libyaml,brimworks/libyaml,brimworks/libyaml