'Returns true if the teams feature is enabled in the course.
Args:
course (CourseDescriptor): the course using the feature
user (User): the user interacting with the course'

@classmethod
def is_enabled(cls, course, user=None):

    if (not super(TeamsTab, cls).is_enabled(course, user=user)):
        return False
    return is_feature_enabled(course)
