Fix throwing correct reason.

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

@@ -964,6 +964,8 @@ public class YoutubeStreamExtractor extends StreamExtractor {
                 if (detailedErrorMessage != null && detailedErrorMessage.contains("country")) {
                     throw new GeographicRestrictionException(
                             "This video is not available in client's country.");
+                } else if (detailedErrorMessage != null) {
+                    throw new ContentNotAvailableException(detailedErrorMessage);
                 } else {
                     throw new ContentNotAvailableException(reason);
                 }