Conversation menu item "Send system activity -> conversationUpdate( userAdded )" isn't working properly

[tonyanziano]

Version

v4.9.0

Describe the bug

For more context, see this comment thread.

To Reproduce

Steps to reproduce the behavior:

1. Open a conversation with a bot
2. Select "Conversation" -> "Send System Activity -> conversationUpdate" menu item
3. Malformed / no conversation update gets sent to bot

Expected behavior

The Emulator should send a conversation update to the bot.