Bug 20207: Don't show search options when no suggestions show

Bug 20207: Don't show search options when no suggestions show

When you are not logged in and OPACViewOthersSuggestions is
deactivated, you don't see any suggestions.

When we see no suggestions, we should also not show the option
to serach in suggestions.

To test:
* as a logged in user and logged out, try various combinations of:
  * OPACViewOthersSuggestions
  * AnonSuggestions
* Verify display matches expectations (new button, shown suggestions,
  search input)

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>