End beta mode, update versions, handle null SongId

The `IsBeta` flag in `App.xaml.cs` was changed from `true` to `false`, indicating that the application is no longer in beta mode.

The assembly version and file version in `AssemblyInfo.cs` were updated from `1.6.6.6` to `1.6.7.1`.

In `SongFetcher.cs`, the assignment to `GlobalObjects.Canvas` was modified to handle the case where `songInfo.SongId` is `null`. If `songInfo.SongId` is `null`, `GlobalObjects.Canvas` is set to a new `Tuple` with `false` and an empty string.

In `WebHelper.cs`, a minor formatting change was made to the `catch` block to remove the space between `Exception` and the closing parenthesis.

A new check was added in the `GetCanvasAsync` method in `WebHelper.cs` to return a `Tuple` with `false` and an empty string if `songInfo.SongId` is `null` or empty.

Songify Slim/App.xaml.cs

@@ -20,7 +20,7 @@ namespace Songify_Slim
     public partial class App
     {
         private static Mutex _mutex;
-        public static bool IsBeta = true;
+        public static bool IsBeta = false;
 
         private void Application_DispatcherUnhandledException(object sender, DispatcherUnhandledExceptionEventArgs e)
         {

Songify Slim/Properties/AssemblyInfo.cs

@@ -50,7 +50,7 @@
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.6.289.1634")]
-[assembly: AssemblyVersion("1.6.6.6")]
-[assembly: AssemblyFileVersion("1.6.6.6")]
+[assembly: AssemblyVersion("1.6.7.1")]
+[assembly: AssemblyFileVersion("1.6.7.1")]
 [assembly: NeutralResourcesLanguage("en")]
 [assembly: Guid("442379e3-32d8-42d1-ab09-cba229672453")]

Songify Slim/Util/Songify/SongFetcher.cs

@@ -618,8 +618,7 @@ public async Task FetchSpotifyWeb()
 
                     GlobalObjects.CurrentSong = songInfo;
                     _canvasResponse = await WebHelper.GetCanvasAsync(songInfo.SongId);
-                    GlobalObjects.Canvas = _canvasResponse;
-
+                    GlobalObjects.Canvas = songInfo.SongId != null ? _canvasResponse : new Tuple<bool, string>(false, "");
                     //if current track is on skiplist, skip it
                     if (GlobalObjects.SkipList.Find(o => o.Trackid == songInfo.SongId) != null)
                     {

Songify Slim/Util/Songify/WebHelper.cs

@@ -113,7 +113,7 @@ await Application.Current.Dispatcher.BeginInvoke(new Action(() =>
                         throw new ArgumentOutOfRangeException(nameof(method), method, null);
                 }
             }
-            catch (Exception )
+            catch (Exception)
             {
                 //Console.WriteLine(e);
             }
@@ -217,6 +217,10 @@ public static async Task<List<PSA>> GetPSA()
 
         public static async Task<Tuple<bool, string>> GetCanvasAsync(string songInfoSongId)
         {
+            if (string.IsNullOrEmpty(songInfoSongId))
+            {
+                return new Tuple<bool, string>(false, "");
+            }
             string result = await ApiClient.GetCanvas(songInfoSongId);
             result = result.Replace("\"", "");
             return result != "No canvas found" ? new Tuple<bool, string>(true, result) : new Tuple<bool, string>(false, "");