[47124483] tune-up the 'new candidate' page

Only departments that contain openings are available for choose.

Signed-off-by: Henry Chen <hchen@vmware.com>
Merge branch 'master' of github.com:vmw-tmpst/heroapp-LetsHire into style
Merge pull request #60 from Henry-CF/bugfix

[47124483] tune-up the 'new candidate' page