Bandcamp playlist extractor: support playlists with just one stream

extractor/src/main/java/org/schabi/newpipe/extractor/services/bandcamp/extractors/BandcampPlaylistExtractor.java

@@ -49,9 +49,9 @@ public class BandcampPlaylistExtractor extends PlaylistExtractor {
 
 
 
-        if (trackInfo.length() <= 1) {
-            // In this case, we are actually viewing a track page!
-            throw new ContentNotAvailableException("Album needs to be purchased or is actually a track");
+        if (trackInfo.length() < 0) {
+            // Albums without trackInfo need to be purchased before they can be played
+            throw new ContentNotAvailableException("Album needs to be purchased");
         }
     }
 

extractor/src/test/java/org/schabi/newpipe/extractor/services/bandcamp/BandcampPlaylistExtractorTest.java

@@ -60,4 +60,16 @@ public class BandcampPlaylistExtractorTest {
         PlaylistExtractor extractor = bandcamp.getPlaylistExtractor("https://billwurtz.bandcamp.com/album/high-enough");
         extractor.fetchPage();
     }
+
+    /**
+     * Test playlist with just one track
+     */
+    @Test
+    public void testSingleStreamPlaylist() throws ExtractionException, IOException {
+        PlaylistExtractor extractor = bandcamp.getPlaylistExtractor("https://zachjohnson1.bandcamp.com/album/endless");
+        extractor.fetchPage();
+
+        assertEquals(1, extractor.getStreamCount());
+
+    }
 }