LeaderboardResultToEntries return null not zero size Array

[ZhangHuan0407]

Is your feature request related to a problem? Please describe.

• When I was using leaderboard.GetScoresForUsersAsync(SteamId[]), I noticed that if all your friends aren't on the leaderboard, null would be returned.
• If the network connection is interrupted and the leaderboard data cannot be obtained, null is returned.
• This return value confuses me, because I can't speculate from the return value data whether the current prompt for "network error" should be displayed, or if all of my friends don't have a score.

// Leaderboard
    public async Task<LeaderboardEntry[]> GetScoresForUsersAsync(SteamId[] users)
    {
        if (users == null || users.Length == 0)
        {
            return null;
        }

        LeaderboardScoresDownloaded_t? leaderboardScoresDownloaded_t = await SteamUserStats.Internal.DownloadLeaderboardEntriesForUsers(Id, users, users.Length);
        // !!!!!!!!!!!!!!!! I'm guessing it could be return null, when the network connection drops?
        if (!leaderboardScoresDownloaded_t.HasValue)
        {
            return null;
        }

        return await LeaderboardResultToEntries(leaderboardScoresDownloaded_t.Value);
    }

    internal async Task<LeaderboardEntry[]> LeaderboardResultToEntries(LeaderboardScoresDownloaded_t r)
    {
        //!!!!!!!!!!!!!!!! I'm guessing it's this branch, but I didn't add logs to debug
        if (r.CEntryCount <= 0)
        {
            return null;
        }

        LeaderboardEntry[] output = new LeaderboardEntry[r.CEntryCount];
        LeaderboardEntry_t pLeaderboardEntry = default(LeaderboardEntry_t);
        for (int i = 0; i < output.Length; i++)
        {
            if (SteamUserStats.Internal.GetDownloadedLeaderboardEntry(r.SteamLeaderboardEntries, i, ref pLeaderboardEntry, detailsBuffer, detailsBuffer.Length))
            {
                output[i] = LeaderboardEntry.From(pLeaderboardEntry, detailsBuffer);
            }
        }

        await WaitForUserNames(output);
        return output;
    }

Describe the solution you'd like

• Try to distinguish between leaderboard data fetch failed and all of my friends aren't on the leaderboard.

Describe alternatives you've considered

• Solution 1: leaderboard.GetScoresForUsersAsync leaderboard.GetScoresAsync
• Add a parameter to tell me that the leaderboard data is fetched failed when it is executed (e.g. StatusCode.NoData and LeaderboardEntry[] are null),
• or if the leaderboard data is returned normally but the length is zero (e.g. StatusCode.HaveData and LeaderboardEntry[] are null)
• Solution 2: If leaderboard data is returned normally, but when the length is zero, Array.Empty() is returned.

Additional context

• This is the first time I used the steam leaderboard feature, I may have misunderstood with the framework.
• If the current version has a callback or parameter that can distinguish between the two cases, it would be appreciated.