feat: don't render role if it has no members in it

Program.cs

@@ -253,6 +253,7 @@ namespace chord
 
 							foreach (var roles in client.GetGuild(currentSelectedGuild).Roles)
 							{
+								if (roles.Members.Count() != 0) {
 									var roleName = Regex.Replace(roles.Name, @"[^\u0000-\u007F]+", string.Empty);
 									var node = new TreeNode(roleName);
 
@@ -269,6 +270,7 @@ namespace chord
 
 									rolesDict.TryAdd(roles.Position, node);
 								}
+							}
 
 							foreach (var role in rolesDict)
 							{