chg: ✅ Added tests for null tax rates

Author: jonathanMindee

tests/documents/test_receipt.py

@@ -181,3 +181,13 @@ def test_empty_object_works():
     assert receipt.total_tax.value is None
 
 
+def test_null_tax_rates_dont_raise():
+    invoice = Receipt(
+        locale="fr",
+        total_incl=12,
+        total_excl=15,
+        taxes={(1, 0), (2, 20)},
+        orientation=0,
+        total_tax=3
+    )
+    assert invoice.checklist["taxes_match_total_incl"] is False