Ignore invalid editor draft payloads (#1533)

tests/test_editor_draft_payload.py

@@ -0,0 +1,24 @@
+import sys
+import types
+from unittest.mock import MagicMock
+
+
+def _load_module(monkeypatch):
+    db_stub = types.ModuleType("core.database")
+    db_stub.EditorDraft = MagicMock()
+    db_stub.SessionLocal = MagicMock()
+    monkeypatch.setitem(sys.modules, "core.database", db_stub)
+    monkeypatch.delitem(sys.modules, "routes.editor_draft_routes", raising=False)
+
+    import routes.editor_draft_routes as mod
+
+    return mod
+
+
+def test_load_payload_rejects_non_object_json(monkeypatch):
+    mod = _load_module(monkeypatch)
+
+    assert mod._load_payload("[]") == {}
+    assert mod._load_payload('"draft"') == {}
+    assert mod._load_payload("{bad json") == {}
+    assert mod._load_payload('{"layers": []}') == {"layers": []}