Investigate / fix - Validation errors when picking people

[diversemix]

Example....

{"error":{"message":"ValidationError: child \"opposedReviewers\" fails because [\"opposedReviewers\" at position 1 fails because [child \"name\" fails because [\"name\" is not allowed to be empty]]]","locations":[{"line":2,"column":3}],"path":["submitManuscript"]},"level":"error","message":"ValidationError: child \"opposedReviewers\" fails because [\"opposedReviewers\" at position 1 fails because [child \"name\" fails because [\"name\" is not allowed to be empty]]]","timestamp":"2019-06-10T09:53:01.143Z"}