Empty directories should not be displayed

[CaptainQuirk]

Hi,

I'm using your tool on gherkin files parsed by Behat which expects a boostrap directory at the same level as the feature files/directories themselves.

When I ignore all those php files through the .featurebookignore, the bootstrap directory and all its subdirectories appear in the spec tree, empty.

[danielpacak]

Hey @CaptainQuirk can you send me your .featurebookignore file so I can reproduce the issue?