code: def get_course_descriptor_content(self, courseid):
          
          path = self._get_course_descriptor_path(courseid)
          return loads_json_or_yaml(path, self._filesystem.get(path).decode("utf-8"))
docs: :param courseid: the course id of the course
          :raise InvalidNameException, CourseNotFoundException, CourseUnreadableException
          :return: the content of the dict that describes the course