Fix display of single item of a select

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | no
| License       | MIT

Pb.: I have added a dud field (single dropdown list) and I can not see the item in the profile view.

Sol.: I have changed the item display plugin to authorize the value of a single select to be rendered.