fix: possible fix for edit setting role icons

DisCatSharp/Entities/Guild/DiscordRole.cs

@@ -24,7 +24,7 @@ public class DiscordRole : SnowflakeObject, IEquatable<DiscordRole>
 	/// </summary>
 	[JsonProperty("name", NullValueHandling = NullValueHandling.Ignore)]
 	public string Name { get; internal set; }
-	
+
 	/// <summary>
 	/// Gets the version number for this role.
 	/// </summary>
@@ -188,7 +188,7 @@ public Task ModifyPositionAsync(int position, string reason = null)
 	/// <exception cref="BadRequestException">Thrown when an invalid parameter was provided.</exception>
 	/// <exception cref="ServerErrorException">Thrown when Discord is unable to process the request.</exception>
 	public Task ModifyAsync(string name = null, Permissions? permissions = null, DiscordColor? color = null, bool? hoist = null, bool? mentionable = null, string reason = null)
-		=> this.Discord.ApiClient.ModifyGuildRoleAsync(this.GuildId, this.Id, name, permissions, color?.Value, hoist, mentionable, null, null, reason);
+		=> this.Discord.ApiClient.ModifyGuildRoleAsync(this.GuildId, this.Id, name, permissions, color?.Value, hoist, mentionable, Optional.None, Optional.None, reason);
 
 	/// <summary>
 	/// Updates this role.
@@ -211,17 +211,27 @@ public Task ModifyAsync(Action<RoleEditModel> action)
 		if (mdl.Icon.HasValue && mdl.Icon.Value != null)
 			iconb64 = ImageTool.Base64FromStream(mdl.Icon);
 		else if (mdl.Icon.HasValue)
-			iconb64 = Optional.Some<string>(null);
+			iconb64 = Optional.Some<string?>(null);
+		else
+			iconb64 = Optional.None;
 
-		var emoji = Optional.FromNullable<string>(null);
+		var emoji = Optional.FromNullable<string?>(null);
 
-		if (mdl.UnicodeEmoji.HasValue && mdl.UnicodeEmoji.Value != null)
-			emoji = mdl.UnicodeEmoji
-				.MapOrNull(e => e.Id == 0
-					? e.Name
-					: throw new ArgumentException("Emoji must be unicode"));
-		else if (mdl.UnicodeEmoji.HasValue)
-			emoji = Optional.Some<string>(null);
+		switch (mdl.UnicodeEmoji.HasValue)
+		{
+			case true when mdl.UnicodeEmoji.Value != null:
+				emoji = mdl.UnicodeEmoji
+					.MapOrNull(e => e.Id == 0
+						? e.Name
+						: throw new ArgumentException("Emoji must be unicode"));
+				break;
+			case true:
+				emoji = Optional.Some<string?>(null);
+				break;
+			case false:
+				emoji = Optional.None;
+				break;
+		}
 
 		return canContinue ? this.Discord.ApiClient.ModifyGuildRoleAsync(this.GuildId, this.Id, mdl.Name, mdl.Permissions, mdl.Color?.Value, mdl.Hoist, mdl.Mentionable, iconb64, emoji, mdl.AuditLogReason) : throw new NotSupportedException($"Cannot modify role icon. Guild needs boost tier two.");
 	}

DisCatSharp/Net/Models/RoleEditModel.cs

@@ -55,7 +55,7 @@ internal RoleEditModel()
 		this.Color = null;
 		this.Hoist = null;
 		this.Mentionable = null;
-		this.Icon = null;
-		this.UnicodeEmoji = null;
+		this.Icon = Optional.None;
+		this.UnicodeEmoji = Optional.None;
 	}
 }

DisCatSharp/Net/Rest/DiscordApiClient.cs

@@ -3374,16 +3374,13 @@ internal async Task<DiscordRole> ModifyGuildRoleAsync(ulong guildId, ulong roleI
 			Mentionable = mentionable,
 		};
 
-		if (emoji.HasValue && !iconb64.HasValue)
-			pld.UnicodeEmoji = emoji;
-
 		if (emoji.HasValue && iconb64.HasValue)
 		{
 			pld.IconBase64 = null;
 			pld.UnicodeEmoji = emoji;
-		}
-
-		if (iconb64.HasValue)
+		} else if (emoji.HasValue && !iconb64.HasValue)
+			pld.UnicodeEmoji = emoji;
+		else if (iconb64.HasValue && !emoji.HasValue)
 			pld.IconBase64 = iconb64;
 
 		var headers = Utilities.GetBaseHeaders();