Fix backend validation if name is required as part of a required non-business invoice address (#4674)

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Co-authored-by: Raphael Michel <michel@rami.io>

src/tests/base/test_questions.py

@@ -0,0 +1,32 @@
+#
+# This file is part of pretix (Community Edition).
+#
+# Copyright (C) 2014-2020 Raphael Michel and contributors
+# Copyright (C) 2020-2021 rami.io GmbH and contributors
+#
+# This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
+# Public License as published by the Free Software Foundation in version 3 of the License.
+#
+# ADDITIONAL TERMS APPLY: Pursuant to Section 7 of the GNU Affero General Public License, additional terms are
+# applicable granting you additional permissions and placing additional restrictions on your usage of this software.
+# Please refer to the pretix LICENSE file to obtain the full terms applicable to this work. If you did not receive
+# this file, see <https://pretix.eu/about/en/license>.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
+# <https://www.gnu.org/licenses/>.
+#
+from pretix.base.forms.questions import name_parts_is_empty
+
+
+def test_name_parts_is_empty():
+    assert name_parts_is_empty({}) is True
+    assert name_parts_is_empty({"_scheme": "foo"}) is True
+    assert name_parts_is_empty({"_scheme": "foo", "full_name": ""}) is True
+    assert name_parts_is_empty({"full_name": None}) is True
+    assert name_parts_is_empty({"full_name": "Flora Nord"}) is False
+    assert name_parts_is_empty({"_scheme": "foo", "given_name": "Alice"}) is False
+    assert name_parts_is_empty({"_legacy": "Alice"}) is False