fix redirect channels

Author: B0pol

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

@@ -2,7 +2,6 @@
 
 import com.grack.nanojson.JsonArray;
 import com.grack.nanojson.JsonObject;
-
 import org.schabi.newpipe.extractor.Page;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.channel.ChannelExtractor;
@@ -18,13 +17,10 @@
 import org.schabi.newpipe.extractor.stream.StreamInfoItemsCollector;
 import org.schabi.newpipe.extractor.utils.Utils;
 
-import java.io.IOException;
-
 import javax.annotation.Nonnull;
+import java.io.IOException;
 
-import static org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper.fixThumbnailUrl;
-import static org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper.getJsonResponse;
-import static org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper.getTextFromObject;
+import static org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper.*;
 import static org.schabi.newpipe.extractor.utils.JsonUtils.EMPTY_STRING;
 import static org.schabi.newpipe.extractor.utils.Utils.isNullOrEmpty;
 
@@ -87,7 +83,8 @@ public void onFetchPage(@Nonnull Downloader downloader) throws IOException, Extr
 
             final String browseId = endpoint.getObject("browseEndpoint").getString("browseId", EMPTY_STRING);
 
-            if (webPageType.equalsIgnoreCase("WEB_PAGE_TYPE_BROWSE") && !browseId.isEmpty()) {
+            if (webPageType.equalsIgnoreCase("WEB_PAGE_TYPE_BROWSE")
+                    || webPageType.equalsIgnoreCase("WEB_PAGE_TYPE_CHANNEL") && !browseId.isEmpty()) {
                 if (!browseId.startsWith("UC")) {
                     throw new ExtractionException("Redirected id is not pointing to a channel");
                 }
@@ -191,12 +188,7 @@ public long getSubscriberCount() throws ParsingException {
                 throw new ParsingException("Could not get subscriber count", e);
             }
         } else {
-            // If there's no subscribe button, the channel has the subscriber count disabled
-            if (c4TabbedHeaderRenderer.has("subscribeButton")) {
-                return 0;
-            } else {
-                return -1;
-            }
+            return ITEM_COUNT_UNKNOWN;
         }
     }