fix(YouTube - Spoof signature): fix error toast when viewing very old YouTube videos (#525)

app/src/main/java/app/revanced/integrations/patches/spoof/SpoofSignaturePatch.java

@@ -169,7 +169,17 @@ public class SpoofSignaturePatch {
      * if {@link SettingsEnum#SPOOF_STORYBOARD_RENDERER} is not enabled.
      */
     public static boolean getSeekbarThumbnailOverrideValue() {
-        return SettingsEnum.SPOOF_SIGNATURE.getBoolean();
+        if (!SettingsEnum.SPOOF_SIGNATURE.getBoolean()) {
+            return false;
+        }
+        StoryboardRenderer renderer = videoRenderer;
+        if (renderer == null) {
+            // Spoof storyboard renderer is turned off,
+            // video is paid, or the storyboard fetch timed out.
+            // Show empty thumbnails so the seek time and chapters still show up.
+            return true;
+        }
+        return renderer.getSpec() != null;
     }
 
     /**

app/src/main/java/app/revanced/integrations/patches/spoof/StoryboardRenderer.java

@@ -1,23 +1,23 @@
 package app.revanced.integrations.patches.spoof;
 
-import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
 import org.jetbrains.annotations.NotNull;
 
 public final class StoryboardRenderer {
+    @Nullable
     private final String spec;
     private final boolean isLiveStream;
     @Nullable
     private final Integer recommendedLevel;
 
-    public StoryboardRenderer(String spec, boolean isLiveStream, @Nullable Integer recommendedLevel) {
+    public StoryboardRenderer(@Nullable String spec, boolean isLiveStream, @Nullable Integer recommendedLevel) {
         this.spec = spec;
         this.isLiveStream = isLiveStream;
         this.recommendedLevel = recommendedLevel;
     }
 
-    @NonNull
+    @Nullable
     public String getSpec() {
         return spec;
     }

app/src/main/java/app/revanced/integrations/patches/spoof/requests/StoryboardRendererRequester.java

@@ -24,6 +24,14 @@ import app.revanced.integrations.utils.ReVancedUtils;
 
 public class StoryboardRendererRequester {
 
+    /**
+     * For videos that have no storyboard.
+     * Usually for low resolution videos as old as YouTube itself.
+     * Does not include paid videos where the renderer fetch fails.
+     */
+    private static final StoryboardRenderer emptyStoryboard
+            = new StoryboardRenderer(null, false, null);
+
     private StoryboardRendererRequester() {
     }
 
@@ -105,6 +113,10 @@ public class StoryboardRendererRequester {
     private static StoryboardRenderer getStoryboardRendererUsingResponse(@NonNull JSONObject playerResponse) {
         try {
             LogHelper.printDebug(() -> "Parsing response: " + playerResponse);
+            if (!playerResponse.has("storyboards")) {
+                LogHelper.printDebug(() -> "Using empty storyboard");
+                return emptyStoryboard;
+            }
             final JSONObject storyboards = playerResponse.getJSONObject("storyboards");
             final boolean isLiveStream = storyboards.has("playerLiveStoryboardSpecRenderer");
             final String storyboardsRendererTag = isLiveStream