✅ Fix tests

tests/test_pins.py

@@ -87,7 +87,7 @@ def test_get_pin(token, user_id):
     assert data["description"] == "Test Description"
     assert data["location"] == [0,0]
     assert image_id in data["files"]
-    assert "date" not in data
+    assert data["date"] is None
     
     # Test avec date
     pin_id_with_date = create_test_pin(token, user_id, image_id, with_date=True)
@@ -134,7 +134,7 @@ def test_update_pin(token, user_id):
     assert data["description"] == "Updated Description"
     assert data["location"] == [1,1]
     assert image_id in data["files"]
-    assert "date" not in data
+    assert data["date"] is None
     
     # Test mise à jour avec date
     response = client.patch(