added additional path null check

Author: Mrxx99

src/GameJoltLibrary/GameJoltMetadataProvider.cs

@@ -2,13 +2,11 @@
 using System.Collections.Generic;
 using System.Globalization;
 using System.Linq;
-using System.Threading;
 using System.Web;
 using AngleSharp;
 using AngleSharp.Dom;
 using AngleSharp.Dom.Html;
 using AngleSharp.Extensions;
-using GameJoltLibrary.Models;
 using Playnite.SDK;
 using Playnite.SDK.Models;
 using Polly;
@@ -61,7 +59,7 @@ public override GameMetadata GetMetadata(Game game)
 
                 // Developer
                 if (!string.IsNullOrEmpty(installedGameMetadata.Developer?.DisplayName))
-                 {
+                {
                     metadata.Developers.Add(new MetadataNameProperty(installedGameMetadata.Developer.DisplayName));
                 }
 

src/GameJoltLibrary/InstalledGamesProvider.cs

@@ -48,7 +48,7 @@ public Dictionary<string, GameMetadata> GetInstalledGamesV2(LibraryGetGamesArgs
 
             };
 
-            foreach (var package in packagesForGame)
+            foreach (var package in packagesForGame.Where(p => !string.IsNullOrEmpty(p.InstallDir)))
             {
                 var launchOption = GetFittingLaunchOption(package);