Training request form: validate review_process and group_name
Training request form: validate review_process and group_name

Group name (registration code) is required for when review_process is
'preapproved', but must be empty when review_process is 'open'.

swcarpentry/amy,pbanaszkiewicz/amy,swcarpentry/amy,pbanaszkiewicz/amy,pbanaszkiewicz/amy,swcarpentry/amy