Describe the bug
In my demo app (https://github.com/redbrogdon/workout_buddy), I've wired up ConversationContentReceived messages from the Conversation so they're displayed as snackbars. Many of the messages include unnecessary newlines at the beginning or end, and sometimes I'll get a message that's just a newline with no other content.

To Reproduce

• Clone and run the app
• Enter "Leg day workout!" in the text field and tap Send
• Watch the snackbars that appear

Expected behavior
Ideally the content strings would be trimmed, and empty strings would be filtered out of the stream entirely.