Fix incorrect 'Course not unique!' errors
Fix incorrect 'Course not unique!' errors

An ActiveRecord find_all method ALWAYS returns an Array.

This fixes a long series of errors in the log that look like this:

  Course not unique! PE/HEALTH, nnn, found 1 entries

concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse