Return the total incompleted points this sprint.

def removedIssuesEstimateSum(self, board_id, sprint_id):
        """Return the total incompleted points this sprint."""
        return self._get_json('rapid/charts/sprintreport?rapidViewId=%s&sprintId=%s' % (board_id, sprint_id),
                              base=self.AGILE_BASE_URL)['contents']['puntedIssuesEstimateSum']['value']