Add test for userdbs.views.AddUserDatabase

This commit adds tests for userdbs.views.AddUserDatabase, the view
itself has been modified so that it is only reachable when the hosting
package actually has database options available.

gnuviechadmin/userdbs/views.py

@@ -4,6 +4,7 @@ This module defines views for user database handling.
 """
 from __future__ import absolute_import, unicode_literals
 
+from django.core.exceptions import SuspiciousOperation
 from django.shortcuts import redirect
 from django.utils.translation import ugettext as _
 from django.views.generic.edit import (
@@ -48,6 +49,9 @@ class AddUserDatabase(
                 db_user__db_type=opt['db_type']).count()
             if dbs_of_type < opt['number']:
                 retval.append((opt['db_type'], DB_TYPES[opt['db_type']]))
+        if len(retval) < 1:
+            raise SuspiciousOperation(
+                _("The hosting package has no database products assigned."))
         return retval
 
     def get_form_kwargs(self):