fix(youtube): tolerate missing fields in channel-search playlist items

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

@@ -12,6 +12,7 @@
 import org.schabi.newpipe.extractor.playlist.PlaylistInfo;
 import org.schabi.newpipe.extractor.playlist.PlaylistInfoItemExtractor;
 import org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper;
+import org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubePlaylistLinkHandlerFactory;
 
 import javax.annotation.Nonnull;
 
@@ -33,16 +34,38 @@ public String getName() throws ParsingException {
 
     @Override
     public String getUrl() throws ParsingException {
+        // Mixes and radio renderers expose a ready-to-share "shareUrl"; use it when present.
         final String url = mixInfoItem.getString("shareUrl");
-        if (isNullOrEmpty(url)) {
-            throw new ParsingException("Could not get url");
+        if (!isNullOrEmpty(url)) {
+            return url;
         }
-        return url;
+        // Regular channel playlists surfaced in channel tabs (e.g. channel-search results)
+        // carry no "shareUrl" but have a "playlistId". Rebuild the canonical playlist URL
+        // from it instead of throwing "Could not get url", which used to abort the whole
+        // item and surface a spurious error snackbar to the user while the other results
+        // kept loading fine (#2546).
+        final String playlistId = mixInfoItem.getString("playlistId");
+        if (!isNullOrEmpty(playlistId)) {
+            try {
+                return YoutubePlaylistLinkHandlerFactory.getInstance().getUrl(playlistId);
+            } catch (final Exception e) {
+                throw new ParsingException("Could not get url", e);
+            }
+        }
+        throw new ParsingException("Could not get url");
     }
 
     @Override
     public String getThumbnailUrl() throws ParsingException {
-        return getThumbnailUrlFromInfoItem(mixInfoItem);
+        // A thumbnail is optional: some incomplete playlist/mix items surfaced in channel
+        // tabs (e.g. channel-search results) carry no usable thumbnail. Return null rather
+        // than throwing, so the item still shows up (with a placeholder) instead of being
+        // turned into a user-facing error snackbar (#2546).
+        try {
+            return getThumbnailUrlFromInfoItem(mixInfoItem);
+        } catch (final ParsingException e) {
+            return null;
+        }
     }
 
     @Override
@@ -56,7 +79,10 @@ public long getStreamCount() throws ParsingException {
         final String countString = YoutubeParsingHelper.getTextFromObject(
                 mixInfoItem.getObject("videoCountShortText"));
         if (countString == null) {
-            throw new ParsingException("Could not extract item count for playlist/mix info item");
+            // The item count is optional too: some incomplete playlist/mix items have no
+            // "videoCountShortText". Report "unknown" rather than throwing, so the item is
+            // still committed instead of bubbling up a spurious error (#2546).
+            return ListExtractor.ITEM_COUNT_UNKNOWN;
         }
 
         try {