Fix NRE of description check for user/message commands

src/Discord.Net.Rest/DiscordRestApiClient.cs

@@ -1142,8 +1142,13 @@ namespace Discord.API
             Preconditions.NotNull(command, nameof(command));
             Preconditions.AtMost(command.Name.Length, 32, nameof(command.Name));
             Preconditions.AtLeast(command.Name.Length, 3, nameof(command.Name));
-            Preconditions.AtMost(command.Description.Length, 100, nameof(command.Description));
-            Preconditions.AtLeast(command.Description.Length, 1, nameof(command.Description));
+
+            if (command.Type == ApplicationCommandType.Slash)
+            {
+                Preconditions.NotNullOrEmpty(command.Description, nameof(command.Description));
+                Preconditions.AtMost(command.Description.Length, 100, nameof(command.Description));
+                Preconditions.AtLeast(command.Description.Length, 1, nameof(command.Description));
+            }
 
             options = RequestOptions.CreateOrClone(options);
 
@@ -1180,40 +1185,6 @@ namespace Discord.API
 
             return await TrySendApplicationCommand(SendJsonAsync<ApplicationCommand[]>("PUT", () => $"applications/{this.CurrentUserId}/commands", commands, new BucketIds(), options: options)).ConfigureAwait(false);
         }
-        public async Task<ApplicationCommand> CreateGlobalApplicationUserCommandAsync(CreateApplicationCommandParams command, RequestOptions options = null)
-        {
-            Preconditions.NotNull(command, nameof(command));
-            Preconditions.AtMost(command.Name.Length, 32, nameof(command.Name));
-            Preconditions.AtLeast(command.Name.Length, 3, nameof(command.Name));
-
-            options = RequestOptions.CreateOrClone(options);            
-
-            return await TrySendApplicationCommand(SendJsonAsync<ApplicationCommand>("POST", () => $"applications/{this.CurrentUserId}/commands", command, new BucketIds(), options: options)).ConfigureAwait(false);
-        }        
-        public async Task<ApplicationCommand> CreateGlobalApplicationMessageCommandAsync(CreateApplicationCommandParams command, RequestOptions options = null)
-        {
-            Preconditions.NotNull(command, nameof(command));
-            Preconditions.AtMost(command.Name.Length, 32, nameof(command.Name));
-            Preconditions.AtLeast(command.Name.Length, 3, nameof(command.Name));
-
-            options = RequestOptions.CreateOrClone(options);
-
-            return await TrySendApplicationCommand(SendJsonAsync<ApplicationCommand>("POST", () => $"applications/{this.CurrentUserId}/commands", command, new BucketIds(), options: options)).ConfigureAwait(false);
-        }
-
-        public async Task<ApplicationCommand[]> BulkOverwriteGlobalApplicationUserCommands(CreateApplicationCommandParams[] commands, RequestOptions options = null)
-        {
-            options = RequestOptions.CreateOrClone(options);
-
-            return await TrySendApplicationCommand(SendJsonAsync<ApplicationCommand[]>("PUT", () => $"applications/{this.CurrentUserId}/commands", commands, new BucketIds(), options: options)).ConfigureAwait(false);
-        }
-
-        public async Task<ApplicationCommand[]> BulkOverwriteGlobalApplicationMessageCommands(CreateApplicationCommandParams[] commands, RequestOptions options = null)
-        {
-            options = RequestOptions.CreateOrClone(options);
-
-            return await TrySendApplicationCommand(SendJsonAsync<ApplicationCommand[]>("PUT", () => $"applications/{this.CurrentUserId}/commands", commands, new BucketIds(), options: options)).ConfigureAwait(false);
-        }
 
         public async Task<ApplicationCommand[]> GetGuildApplicationCommandsAsync(ulong guildId, RequestOptions options = null)
         {
@@ -1239,6 +1210,17 @@ namespace Discord.API
 
         public async Task<ApplicationCommand> CreateGuildApplicationCommandAsync(CreateApplicationCommandParams command, ulong guildId, RequestOptions options = null)
         {
+            Preconditions.NotNull(command, nameof(command));
+            Preconditions.AtMost(command.Name.Length, 32, nameof(command.Name));
+            Preconditions.AtLeast(command.Name.Length, 3, nameof(command.Name));
+
+            if (command.Type == ApplicationCommandType.Slash)
+            {
+                Preconditions.NotNullOrEmpty(command.Description, nameof(command.Description));
+                Preconditions.AtMost(command.Description.Length, 100, nameof(command.Description));
+                Preconditions.AtLeast(command.Description.Length, 1, nameof(command.Description));
+            }
+
             options = RequestOptions.CreateOrClone(options);
 
             var bucket = new BucketIds(guildId: guildId);