Bug 25279: (QA follow-up) Original behaviour

Bug 25279: (QA follow-up) Original behaviour

This patch does the following things:
- Uses a call to Koha::Cities->search(*)->count to display the same
  message we displayed before when no city was found/defined (datatable
  not rendered at all).
- Restores the main search box functionality, the passed param is used
  to query on the city name with wildcards on both sides, for (a)
  counting results and for (b) apending to the API call with the same
  behaviour.

The only missing bit from QA is HTML/URI escaping values from cells, but
this is going to happen at DT level most sure.

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>