[migration] fix handling of default value for boolean attributes We can't assert that the old value is 'True' or 'False', because False used to be stored as an empty string in pre-3.18 versions.

Cubes
=====

This chapter describes how to define your own cubes and reuse already available cubes.

.. toctree::
   :maxdepth: 1

   layout.rst
   cc-newcube.rst
   available-cubes.rst