Allow PlayLists with missing uploader

This supports PR 2724 in NewPipe

extractor/src/main/java/org/schabi/newpipe/extractor/playlist/PlaylistInfo.java

@@ -45,6 +45,9 @@ public class PlaylistInfo extends ListInfo<StreamInfoItem> {
                 extractor.getServiceId(),
                 extractor.getLinkHandler(),
                 extractor.getName());
+        // collect uploader extraction failures until we are sure this is not
+        // just a playlist without an uploader
+        List<Throwable> uploaderParsingErros = new ArrayList<Throwable>(3);
 
         try {
             info.setOriginalUrl(extractor.getOriginalUrl());
@@ -64,23 +67,31 @@ public class PlaylistInfo extends ListInfo<StreamInfoItem> {
         try {
             info.setUploaderUrl(extractor.getUploaderUrl());
         } catch (Exception e) {
-            info.addError(e);
+            info.setUploaderUrl("");
+            uploaderParsingErros.add(e);
         }
         try {
             info.setUploaderName(extractor.getUploaderName());
         } catch (Exception e) {
-            info.addError(e);
+            info.setUploaderName("");
+            uploaderParsingErros.add(e);
         }
         try {
             info.setUploaderAvatarUrl(extractor.getUploaderAvatarUrl());
         } catch (Exception e) {
-            info.addError(e);
+            info.setUploaderAvatarUrl("");
+            uploaderParsingErros.add(e);
         }
         try {
             info.setBannerUrl(extractor.getBannerUrl());
         } catch (Exception e) {
             info.addError(e);
         }
+        // do not fail if everything but the uploader infos could be collected
+        if (uploaderParsingErros.size() > 0 &&
+                (!info.getErrors().isEmpty() || uploaderParsingErros.size() < 3)) {
+            info.addAllErrors(uploaderParsingErros);
+        }
 
         final InfoItemsPage<StreamInfoItem> itemsPage = ExtractorHelper.getItemsPageOrLogError(info, extractor);
         info.setRelatedItems(itemsPage.getItems());