Validation failure does not focus spotlight screens that have not chosen templates

[freshstrangemusic]

STR:

1. Create a new spotlight message. Fill in required fields
2. Add a screen, but do not choose a template
3. Add a screen and choose a template. Fill in required fields.
4. Click "Show JSON"

ER:
The first spotlight screen input should be focused.

AR:
Nothing happens, due to there being no registered input to call focus on.