Auto submission cron job creates empty individual submissions despite having a team submission

[RichDom2185]

As per title.

For team assessments, despite the student already having a submission for their team, when the deadline comes, the auto-close/auto-submit cron job is not able to find their submissions, and as a result, two things happen:

• Their actual team submission is not autoclosed and submitted, potentially allowing them to bypass the deadline
• A new empty individual submission is created for each student, resulting in a precondition error when they try to load their assessments page (since there are 2 submissions associated with the same assessment for the same student – their individual one and team one)