Fixes at least the problem with empty story files, that contain no
scenario. I could not reproduce the other mentioned bug with missing
description. The description in the JUnitScenarioReporter is referring
to the JUnit description, which is basically the line to represent the
story, scenario or step in JUnit. It is not referring to some textual
description in the story.

If you think this bug should be reopened, please provide a story to
reproduce the problem. Thanks!

Fixes #28