views: enable client partitioning without cache

Remove the check that disables creating a client without cache.
This is the initial step towards unicast restoration support.

ogcp/views.py

@@ -658,10 +658,6 @@ def action_setup_modify():
                 flash(_('Partitions can\'t have a size of zero or lower'), category='error')
                 return redirect(url_for('commands'))
 
-        if cache_count == 0:
-            flash(_(f'Missing cache partition'), category='error')
-            return redirect(url_for('commands'))
-
         if cache_count > 1:
             flash(_(f'More than one cache partition is not supported'), category='error')
             return redirect(url_for('commands'))