Fixed several model processing bugs

src/Discord.Net/API/DiscordRawClient.cs

@@ -219,7 +219,7 @@ namespace Discord.API
             switch (channels.Length)
             {
                 case 0:
-                    throw new ArgumentOutOfRangeException(nameof(args));
+                    return;
                 case 1:
                     await ModifyGuildChannel(channels[0].Id, new ModifyGuildChannelParams { Position = channels[0].Position }).ConfigureAwait(false);
                     break;
@@ -476,8 +476,10 @@ namespace Discord.API
 
             if (result.Count > 1)
                 return result.SelectMany(x => x);
-            else
+            else if (result.Count == 1)
                 return result[0];
+            else
+                return Array.Empty<GuildMember>();
         }
         public async Task RemoveGuildMember(ulong guildId, ulong userId)
         {
@@ -535,7 +537,7 @@ namespace Discord.API
             switch (roles.Length)
             {
                 case 0:
-                    throw new ArgumentOutOfRangeException(nameof(args));
+                    return Array.Empty<Role>();
                 case 1:
                     return ImmutableArray.Create(await ModifyGuildRole(guildId, roles[0].Id, roles[0]).ConfigureAwait(false));
                 default:
@@ -580,10 +582,12 @@ namespace Discord.API
                 if (models.Length != DiscordConfig.MaxMessagesPerBatch) { i++; break; }
             }
 
-            if (runs > 1)
-                return result.Take(runs).SelectMany(x => x);
-            else
+            if (i > 1)
+                return result.Take(i).SelectMany(x => x);
+            else if (i == 1)
                 return result[0];
+            else
+                return Array.Empty<Message>();
         }
         public Task<Message> CreateMessage(ulong channelId, CreateMessageParams args)
             => CreateMessage(0, channelId, args);
@@ -636,7 +640,7 @@ namespace Discord.API
             switch (messageIds.Length)
             {
                 case 0:
-                    throw new ArgumentOutOfRangeException(nameof(args.MessageIds));
+                    return;
                 case 1:
                     await DeleteMessage(guildId, channelId, messageIds[0]).ConfigureAwait(false);
                     break;

src/Discord.Net/Rest/Entities/Guilds/Guild.cs

@@ -81,11 +81,11 @@ namespace Discord.Rest
             {
                 var emojis = ImmutableArray.CreateBuilder<Emoji>(model.Emojis.Length);
                 for (int i = 0; i < model.Emojis.Length; i++)
-                    emojis[i] = new Emoji(model.Emojis[i]);
+                    emojis.Add(new Emoji(model.Emojis[i]));
                 Emojis = emojis.ToArray();
             }
             else
-                Emojis = ImmutableArray<Emoji>.Empty;
+                Emojis = Array.Empty<Emoji>();
 
             var roles = new ConcurrentDictionary<ulong, Role>(1, model.Roles?.Length ?? 0);
             if (model.Roles != null)

src/Discord.Net/Rest/Entities/Message.cs

@@ -68,7 +68,7 @@ namespace Discord.Rest
                 Attachments = ImmutableArray.Create(attachments);
             }
             else
-                Attachments = ImmutableArray<Attachment>.Empty;
+                Attachments = Array.Empty<Attachment>();
 
             if (model.Embeds.Length > 0)
             {
@@ -78,18 +78,18 @@ namespace Discord.Rest
                 Embeds = ImmutableArray.Create(embeds);
             }
             else
-                Embeds = ImmutableArray<Embed>.Empty;
+                Embeds = Array.Empty<Embed>();
 
             if (model.Mentions.Length > 0)
             {
                 var discord = Discord;
                 var builder = ImmutableArray.CreateBuilder<PublicUser>(model.Mentions.Length);
                 for (int i = 0; i < model.Mentions.Length; i++)
-                    builder[i] = new PublicUser(discord, model.Mentions[i]);
+                    builder.Add(new PublicUser(discord, model.Mentions[i]));
                 MentionedUsers = builder.ToArray();
             }
             else
-                MentionedUsers = ImmutableArray<PublicUser>.Empty;
+                MentionedUsers = Array.Empty<PublicUser>();
             MentionedChannelIds = MentionHelper.GetChannelMentions(model.Content);
             MentionedRoleIds = MentionHelper.GetRoleMentions(model.Content);
             if (model.IsMentioningEveryone)

src/Discord.Net/Rest/Entities/Users/GuildUser.cs

@@ -39,9 +39,9 @@ namespace Discord.Rest
             Nickname = model.Nick;
 
             var roles = ImmutableArray.CreateBuilder<Role>(model.Roles.Length + 1);
-            roles[0] = Guild.EveryoneRole;
+            roles.Add(Guild.EveryoneRole);
             for (int i = 0; i < model.Roles.Length; i++)
-                roles[i + 1] = Guild.GetRole(model.Roles[i]);
+                roles.Add(Guild.GetRole(model.Roles[i]));
             _roles = roles.ToImmutable();
         }