FIX: Correct student list query to ensure all students appear #302
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Existing query lost students if they only had one task that was for a higher grade than their target grade. Introducing a subquery means that all students are returned.
No need to include all projects in the sub query, therefore no need to left join.
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This fixes an issue where students could disappear from Doubtfire if they only had tasks for task definitions higher than their target grade.