ignore missing files

AssetStudioGUI/AssetBrowser.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;
@@ -41,6 +42,12 @@ namespace AssetStudioGUI
         private async void loadSelected_Click(object sender, EventArgs e)
         {
             var files = assetListView.SelectedRows.Cast<DataGridViewRow>().Select(x => x.DataBoundItem as AssetEntry).Select(x => x.Source).ToHashSet();
+            var missingFiles = files.Where(x => !File.Exists(x));
+            foreach (var file in missingFiles)
+            {
+                Logger.Warning($"Unable to find file {file}, skipping...");
+                files.Remove(file);
+            }
             if (files.Count != 0 && !files.Any(string.IsNullOrEmpty))
             {
                 Logger.Info("Loading...");