Previously there was a logic bug where by if some students were filtered
from the list, the label for another student could be attached to the
'filered' student.

This fix reworks the promises a bit so we render the student summary and
then build an row with the explict user id, rather than itterating through
the array later.

I also remove the storing of the initial promise in a varible because
this is an easy way to introduce a bug (not waiting for the .then()
chained promise)