Version

4.7.1

Describe the bug

When bot did not send an activity with speak property, DLSpeech channel will not send the WAV stream. Web Chat or Speech SDK should handle this scenario.

Steps to reproduce

1. Connect to MockBot
2. Say "tell me a story"
   • The returned activity does not have speak field set

Expected behavior

Web Chat will not synthesize the activity without "speak" property. But it should continue to function properly.

Additional context

Tagging @stevkan.

[Bug]