Fetch with android only when there's a PoToken.

Author: FireMasterK

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

@@ -818,7 +818,9 @@ public void onFetchPage(@Nonnull final Downloader downloader)
         final PoTokenResult androidPoTokenResult = noPoTokenProviderSet ? null
                 : providerInstance.getAndroidClientPoToken();
 
-        fetchAndroidClient(localization, contentCountry, videoId, androidPoTokenResult);
+        if (androidPoTokenResult != null) {
+            fetchAndroidClient(localization, contentCountry, videoId, androidPoTokenResult);
+        }
 
         final byte[] nextBody = JsonWriter.string(
                 prepareDesktopJsonBuilder(localization, contentCountry)