csv_import: accept empty unmandatory phone (#87581)

src/authentic2/csv_import.py

@@ -564,7 +564,7 @@ class UserCsvImporter:
             except Attribute.DoesNotExist:
                 pass
             else:
-                if attr.kind == 'phone_number':
+                if attr.kind == 'phone_number' and (attr.required or data[header.name]):
                     pn = parse_phone_number(data[header.name])
                     if pn:
                         # fill multi value field

tests/test_user_manager.py

@@ -901,6 +901,7 @@ def test_user_import_attributes(transactional_db, app, admin):
     assert 'Enter a valid date.' in response.text
     assert 'birthdate must be in the past and greater or equal than 1900-01-01.' in response.text
     assert 'The value must be a valid french postcode' in response.text
+    assert 'Enter a valid phone number' in response.text
 
     assert User.objects.count() == user_count + 1
     elliot = User.objects.filter(email='elliot@universalpictures.com')[0]
@@ -926,6 +927,13 @@ def test_user_import_attributes(transactional_db, app, admin):
     assert et.attributes.values['zip'].content == '42000'
     assert et.attributes.values['phone'].content == '+3281123456'
 
+    # empty not mandatory phone
+    csv_lines[2] = 'et@universalpictures.com,ET,the Extra-Terrestrial,,,,,,42000,'
+    response = import_csv('\n'.join(csv_lines), app)
+    et = User.objects.filter(email='et@universalpictures.com')[0]
+    assert et.attributes.values['phone'].content == ''
+    assert 'Enter a valid phone number' not in response.text
+
 
 def test_detail_view(app, admin, simple_user, freezer, user_ou1, ou1, settings):
     url = f'/manage/users/{simple_user.pk}/'