Do not create encryption handler for text streams

The text stream should not be encrypted.

Fixes #883.

packager/packager.cc

@@ -645,9 +645,9 @@ Status CreateAudioVideoJobs(
       if (!is_text) {
         handlers.emplace_back(std::make_shared<ChunkingHandler>(
             packaging_params.chunking_params));
-      }
         handlers.emplace_back(CreateEncryptionHandler(packaging_params, stream,
                                                       encryption_key_source));
+      }
 
       replicator = std::make_shared<Replicator>();
       handlers.emplace_back(replicator);