LDAP: prefer description over departmentNumber.
Created by: NotSpecial
In #398, we introduced parsing a (new) LDAP field description
, which substitutes the old
departmentNumber
field for new students.
We have however noticed that the departmentNumber
field still exists for (only a few) of the
new students, however with uninformative input such as "Student".
To ensure smooth operation, we should thus check the description field first, as it is the new official field with the information we need, and only fall back to the departmentnumber field if it is missing.