Remove empty message editor placeholder (#7444)

This PR removes the placeholder that we previously displayed for the
chat message editor.

With the changes in #7441 we can no longer hit this codepath.

Release Notes:

- N/A
0b2a9d2beaMarshall Bowers committed on 2/6/2024, 4:37:08 PM· committed by GitHubparent960eaf6
1 file changedLine totals unavailable