use ContentNotSupportedException for channels without tabs

Author: B0pol

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

@@ -5,6 +5,7 @@
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.channel.ChannelExtractor;
 import org.schabi.newpipe.extractor.downloader.Downloader;
+import org.schabi.newpipe.extractor.exceptions.ContentNotSupportedException;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.extractor.exceptions.ParsingException;
 import org.schabi.newpipe.extractor.linkhandler.ListLinkHandler;
@@ -310,7 +311,7 @@ private JsonObject getVideoTab() throws ParsingException {
         }
 
         if (videoTab == null) {
-            throw new ParsingException("Could not find Videos tab");
+            throw new ContentNotSupportedException("This channel has no Videos tab");
         }
 
         try {

extractor/src/test/java/org/schabi/newpipe/extractor/services/youtube/YoutubeChannelExtractorTest.java

@@ -5,13 +5,14 @@
 import org.schabi.newpipe.DownloaderTestImpl;
 import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.extractor.channel.ChannelExtractor;
-import org.schabi.newpipe.extractor.channel.ChannelInfo;
 import org.schabi.newpipe.extractor.exceptions.ContentNotAvailableException;
+import org.schabi.newpipe.extractor.exceptions.ContentNotSupportedException;
+import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.extractor.exceptions.ParsingException;
 import org.schabi.newpipe.extractor.services.BaseChannelExtractorTest;
 import org.schabi.newpipe.extractor.services.youtube.extractors.YoutubeChannelExtractor;
 
-import java.util.List;
+import java.io.IOException;
 
 import static org.junit.Assert.*;
 import static org.schabi.newpipe.extractor.ExtractorAsserts.assertEmpty;
@@ -45,6 +46,20 @@ public void nonExistentFetch() throws Exception {
         }
     }
 
+    public static class NotSupported {
+        @BeforeClass
+        public static void setUp() {
+            NewPipe.init(DownloaderTestImpl.getInstance());
+        }
+
+        @Test(expected = ContentNotSupportedException.class)
+        public void noVideoTab() throws Exception {
+            final ChannelExtractor extractor = YouTube.getChannelExtractor("https://invidio.us/channel/UC-9-kyTW8ZkZNDHQJ6FgpwQ");
+            extractor.fetchPage();
+            extractor.getInitialPage();
+        }
+    }
+
     public static class Gronkh implements BaseChannelExtractorTest {
         private static YoutubeChannelExtractor extractor;