Get GO text from GOEA study.

def get_study_txt(self, goid):
        """Get GO text from GOEA study."""
        if goid in self.go2res:
            res = self.go2res[goid]
            if res.study_items is not None:
                return self._get_item_str(res)
            else:
                return self.fmtres.format(study_count=res.study_count)