It's possible to hit the 'build' button with no clips defined

[robby1066]

Describe the bug

The logic for when the 'build' button is present checks to make sure that there are no clips present in a message that are missing a recorded video. The problem with that logic is that it returns true when there are no clips present at all.

Steps To Reproduce

1. Go to compose a message
2. Clear all the clips
3. Save message
4. Observe the "Ready to build" banner on the message edit page

Expected behavior

You shouldn't be able to attempt to build an empty message (which will throw an error anyway), and you should be prompted for how to correct the situation when there are no clips.

Screenshots

[robby1066]

Fixed on Jan 25, 2021