Merge pull request #1417 from FineFindus/fix/short-thumbnails

[YouTube] Extract shorts thumbnails from `thumbnailViewModel`

Author: TobiGr

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeShortsLockupInfoItemExtractor.java

@@ -78,7 +78,15 @@ public String getUrl() throws ParsingException {
     @Nonnull
     @Override
     public List<Image> getThumbnails() throws ParsingException {
-        return getImagesFromThumbnailsArray(shortsLockupViewModel.getObject("thumbnail")
+        if (shortsLockupViewModel.has("thumbnail")) {
+            return getImagesFromThumbnailsArray(shortsLockupViewModel.getObject("thumbnail")
+                .getArray("sources"));
+        }
+
+        return getImagesFromThumbnailsArray(shortsLockupViewModel
+                .getObject("thumbnailViewModel")
+                .getObject("thumbnailViewModel")
+                .getObject("image")
                 .getArray("sources"));
     }