补充战斗校验代码

modules/arena/api_challenge.go

@@ -14,6 +14,17 @@ func (this *apiComp) ChallengeCheck(session comm.IUserSession, req *pb.ArenaChal
 			Title: pb.ErrorCode_ReqParameterError.ToString(),
 		}
 	}
+
+	for _, v := range req.Battle.Format {
+		if v != "" {
+			return
+		}
+	}
+	errdata = &pb.ErrorData{ //没有英雄
+		Code:    pb.ErrorCode_ReqParameterError,
+		Title:   pb.ErrorCode_ReqParameterError.ToString(),
+		Message: "no hero",
+	}
 	return
 }