Python bindings failure when IDYNTREE_USES_ASSIMP is set to OFF?

[traversaro]

In https://github.com/ami-iit/bipedal-locomotion-framework/actions/runs/3705058484/jobs/6278469743 we are experiencing problems like:

Traceback:
../bindings/python/ParametersHandler/tests/test_parameters_handler_std.py:4: in <module>
    import bipedal_locomotion_framework.bindings.parameters_handler as blf
bipedal_locomotion_framework/__init__.py:2: in <module>
    from . import utils
bipedal_locomotion_framework/utils.py:12: in <module>
    import idyntree.swig as idyn
../install/deps/lib/python3/dist-packages/idyntree/__init__.py:1: in <module>
    from . import swig
../install/deps/lib/python3/dist-packages/idyntree/swig.py:13: in <module>
    from . import _iDynTree
E   ImportError: libidyntree-solid-shapes.so: cannot open shared object file: No such file or directory