Fix exception si module sans matiere

app/scodoc/sco_edit_module.py

@@ -321,7 +321,7 @@ def module_edit(
         matieres = [
             mat
             for mat in matieres
-            if ((module is not None) and (module.matiere.id == mat.id))
+            if (module and module.matiere and (module.matiere.id == mat.id))
             or (mat.id == mat.ue.matieres.first().id)
         ]
         mat_names = [