Ensure that progressive contents are URL contents for playback

A ResolverException will be now thrown otherwise.

Author: AudricV

app/src/main/java/org/schabi/newpipe/player/resolver/PlaybackResolver.java

@@ -249,6 +249,9 @@ private static ProgressiveMediaSource buildProgressiveMediaSource(
             final Stream stream,
             final String cacheKey,
             final MediaItemTag metadata) throws ResolverException {
+        if (!stream.isUrl()) {
+            throw new ResolverException("Non URI progressive contents are not supported");
+        }
         throwResolverExceptionIfUrlNullOrEmpty(stream.getContent());
         return dataSource.getProgressiveMediaSourceFactory().createMediaSource(
                 new MediaItem.Builder()
@@ -503,9 +506,9 @@ private static Uri manifestUrlToUri(final String manifestUrl) {
     private static void throwResolverExceptionIfUrlNullOrEmpty(@Nullable final String url)
             throws ResolverException {
         if (url == null) {
-            throw new ResolverException("Null stream url");
+            throw new ResolverException("Null stream URL");
         } else if (url.isEmpty()) {
-            throw new ResolverException("Empty stream url");
+            throw new ResolverException("Empty stream URL");
         }
     }
     //endregion