empty package names makes plantuml file impossible to render.

[Former user]

when running sketchit on certain Maven projects, all packages are included in one 'parent' package with no name. The actual package name is written without the first leading character. plantuml cannot render the generated file. example:

namespace { namespace ontroller { class controller.CoordinatorDashboardController { - courseList : ListView<Course> - questionList : ListView<Question> - quizList : ListView<Quiz> + doEditQuestion() + doEditQuiz() + doMenu() + doNewQuestion() + doNewQuiz() + setup() } } ... }