Skip invalid ownerless JSON rows (#1540)

tests/test_claim_ownerless_json.py

@@ -0,0 +1,18 @@
+from scripts.claim_ownerless import claim_json_entries
+
+
+def test_claim_json_entries_skips_invalid_rows():
+    rows = [
+        {"id": "a"},
+        "bad-row",
+        None,
+        {"id": "b", "owner": "already"},
+    ]
+
+    assert claim_json_entries(rows, "admin") == 1
+    assert rows == [
+        {"id": "a", "owner": "admin"},
+        "bad-row",
+        None,
+        {"id": "b", "owner": "already"},
+    ]