Competition validation: early puzzle submission

[timreyn]

Is your feature request related to a problem? Please describe.
Based on feedback from WCAT, my understanding is that any time there is a multi blind submission activity on the schedule, it's required to select the early_puzzle_submission box. This is a manual step that is easy to forget.

Describe the solution you'd like
Add a validation to Competition to ensure that, if there are any "other-multi" schedule activities, early_puzzle_submission must be checked.

Describe alternatives you've considered

• Automatically set this field when a corresponding schedule activity is added (seems difficult)
• Instead of having this as a field in the competition form, have it be computed based on the schedule (this only works for multi blind; if any other events have early puzzle submission, this would miss those)

[dunkOnIT]

Asking WCAT about auto-setting the field when a corresponding schedule activity is added as that seems like it might be the best solution