'get project data object, return None if not exists'

def get(self, project_name, updatetime=None, md5sum=None):

    if ((time.time() - self.last_check_projects) > self.CHECK_PROJECTS_INTERVAL):
        self._check_projects()
    if self._need_update(project_name, updatetime, md5sum):
        self._update_project(project_name)
    return self.projects.get(project_name, None)
