Description:
Missing python-yaml dependency.

Additional info:
* version 0.20.1-7

Steps to reproduce:
1. Go through tutorial https://wiki.freecadweb.org/FEM_tutorial
2. At the material selection step choose Calculix-Steel as the material and click 'use FreeCAD material editor'.
You will see exception in 'Report View' as follows:

12:50:13 Material card chosen:
/usr/share/freecad/Mod/Material/StandardMaterial/CalculiX-Steel.FCMat
12:50:13
12:50:29 Traceback (most recent call last):
12:50:29 File "/usr/lib/freecad/Mod/Fem/femtaskpanels/task_material_common.py", line 325, in edit_material
12:50:29 new_material_params = MaterialEditor.editMaterial(card_path=self.card_path)
12:50:29 File "/usr/lib/freecad/Mod/Material/MaterialEditor.py", line 798, in editMaterial
12:50:29 editor = MaterialEditor(material=material, card_path=card_path)
12:50:29 File "/usr/lib/freecad/Mod/Material/MaterialEditor.py", line 120, in __init__
12:50:29 self.implementModel()
12:50:29 File "/usr/lib/freecad/Mod/Material/MaterialEditor.py", line 157, in implementModel
12:50:29 template_data = get_material_template(True)
12:50:29 File "/usr/lib/freecad/Mod/Material/materialtools/cardutils.py", line 225, in get_material_template
12:50:29 import yaml
12:50:29 File "/usr/lib/python3.10/site-packages/shiboken2/files.dir/shibokensupport/feature.py", line 139, in _import
12:50:29 return original_import(name, *args, **kwargs)
12:50:29 ModuleNotFoundError: No module named 'yaml'