Loading an non-existing addon directory affect all other modules to be not loaded. This commit makes sure the path exist before proceed to explore all the modules under that directory. closes odoo/odoo#104704 X-original-commit: d77d9f8a9ff945f5f61924eda835c877eb4f281c Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>