Add NoRequireDiscord flag when initializing Discord GameSDK.

Assets/Cryville/Crtr/DiscordController.cs

@@ -1,6 +1,7 @@
 using Discord;
 using System;
 using UnityEngine;
+using Logger = Cryville.Common.Logger;
 
 namespace Cryville.Crtr {
 	internal class DiscordController : MonoBehaviour {
@@ -16,22 +17,31 @@ namespace Cryville.Crtr {
 		void Start() {
 			Instance = this;
 			launchTime = (long)(DateTime.UtcNow - DateTime.UnixEpoch).TotalSeconds;
-			dc = new Discord.Discord(CLIENT_ID, (UInt64)CreateFlags.Default);
+			try {
+				dc = new Discord.Discord(CLIENT_ID, (UInt64)CreateFlags.NoRequireDiscord);
+				Logger.Log("main", 1, "Discord", "Connected to Discord");
 				am = dc.GetActivityManager();
 				SetIdle();
 			}
+			catch (ResultException) {
+				Logger.Log("main", 3, "Discord", "Cannot connect to Discord");
+			}
+		}
 
 		void Update() {
+			if (dc == null) return;
 			dc.RunCallbacks();
 		}
 
 		void OnApplicationQuit() {
+			if (dc == null) return;
 			dc.Dispose();
 		}
 
 		void Callback(Result result) { }
 
 		public void SetIdle() {
+			if (dc == null) return;
 			am.UpdateActivity(new Activity {
 				State = "Idle",
 				Instance = false,
@@ -40,6 +50,7 @@ namespace Cryville.Crtr {
 		}
 
 		public void SetPlaying(string detail, double? duration) {
+			if (dc == null) return;
 			long now = (long)(DateTime.UtcNow - DateTime.UnixEpoch).TotalSeconds;
 			am.UpdateActivity(new Activity {
 				State = "Playing a chart",