fix: UDM网元信息获取为nil异常

features/udm_user/api_udm_user.go

@@ -187,8 +187,8 @@ func NeInfoByUDM(neId string) (*dborm.NeInfo, error) {
 		log.Error("dborm.XormGetNeInfo is failed:", err)
 		return nil, err
 	}
-	if neInfo.Ip == "" {
-		return nil, fmt.Errorf("ne_info not IP")
+	if neInfo == nil || neInfo.Ip == "" {
+		return nil, fmt.Errorf("not ne_info or not IP")
 	}
 	return neInfo, nil
 }