Remove duplicate null check

null check is done in ContainsKey()

Author: VictoriousRaptor

Flow.Launcher.Infrastructure/Image/ImageCache.cs

@@ -1,9 +1,8 @@
-using System;
+using System;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading;
-using System.Threading.Tasks;
 using System.Windows.Media;
 
 namespace Flow.Launcher.Infrastructure.Image

Flow.Launcher.Infrastructure/Image/ImageLoader.cs

@@ -248,7 +248,7 @@ private static BitmapSource GetThumbnail(string path, ThumbnailOptions option =
 
         public static bool CacheContainImage(string path, bool loadFullImage = false)
         {
-            return ImageCache.ContainsKey(path, loadFullImage) && ImageCache[path, loadFullImage] != null;
+            return ImageCache.ContainsKey(path, loadFullImage);
         }
 
         public static async ValueTask<ImageSource> LoadAsync(string path, bool loadFullImage = false)