Do not display a kanban panel when kanban is not activated

This task is part of story #7575 create a "new kanban" on AD homepage

Change-Id: I28db454abe5fdd0dbb7b55b40219dd675fa61d7e
Merge commit 'refs/changes/91/3291/1' of ssh://gerrit.tuleap.net:29418/tuleap into stable

* ssh://gerrit.tuleap.net:29418/tuleap:
  Do not display a kanban panel when kanban is not activated
This is Tuleap 7.7.99.34

Change-Id: Ibbb5d451d21a72b2df9fb57b3b599b23fccc4f20