Merge pull request #1086 from AudricV/yt_no-exception-channels-without-banner

[YouTube] Don't throw an exception when there is no banner available on a channel

Author: TobiGr

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

@@ -282,7 +282,10 @@ public String getBannerUrl() throws ParsingException {
                 ))
                 .filter(url -> !url.contains("s.ytimg.com") && !url.contains("default_banner"))
                 .map(YoutubeParsingHelper::fixThumbnailUrl)
-                .orElseThrow(() -> new ParsingException("Could not get banner"));
+                // Channels may not have a banner, so no exception should be thrown if no banner is
+                // found
+                // Return null in this case
+                .orElse(null);
     }
 
     @Override

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

@@ -2,6 +2,7 @@
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNull;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.junit.jupiter.api.Assertions.fail;
@@ -720,7 +721,8 @@ public void testAvatarUrl() throws Exception {
 
         @Test
         public void testBannerUrl() throws Exception {
-            // CarouselHeaderRender does not contain a banner
+            // CarouselHeaderRenders do not contain a banner
+            assertNull(extractor.getBannerUrl());
         }
 
         @Test