subtle NPE bug: if attempting to create an assignment errors, and there was an assignment upload, then duplicating the assignment would dup the assignment_id, but the upload would get cleaned up, leading to a break
subtle NPE bug: if attempting to create an assignment errors, and there was an assignment upload, then duplicating the assignment would dup the assignment_id, but the upload would get cleaned up, leading to a break

CodeGrade/bottlenose,blerner/bottlenose,NatTuck/bottlenose,blerner/bottlenose,blerner/bottlenose,CodeGrade/bottlenose,CodeGrade/bottlenose,NatTuck/bottlenose,NatTuck/bottlenose,NatTuck/bottlenose,blerner/bottlenose,blerner/bottlenose,blerner/bottlenose,NatTuck/bottlenose,blerner/bottlenose,NatTuck/bottlenose,CodeGrade/bottlenose,CodeGrade/bottlenose,CodeGrade/bottlenose,CodeGrade/bottlenose