Return empty Series for empty differences

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "retrack"
-version = "3.3.2"
+version = "3.3.3"
 description = "A business rules engine"
 authors = ["Gabriel Guarisa <[email protected]>"]
 license = "MIT"

retrack/nodes/datetime.py

@@ -87,6 +87,10 @@ def replace_invalid(value):
         timestamp_1 = input_value_1.apply(replace_invalid)
 
         differences = timestamp_1.sub(timestamp_0)
+
+        if differences.empty:
+            return {"output_value": pd.Series()}
+
         days = differences.dt.days
 
         return {"output_value": days}

tests/test_nodes/test_datetime.py

@@ -186,6 +186,20 @@ def now(cls, tz=None):
     assert (output["output_value"] == pd.Series([30, -30])).all()
 
 
+@pytest.mark.asyncio
+async def test_difference_between_dates_node_run_with_empty_series(
+    difference_between_dates_input_data,
+):
+    difference_between_dates_node = DifferenceBetweenDates(
+        **difference_between_dates_input_data
+    )
+
+    output = await difference_between_dates_node.run(pd.Series(), pd.Series())
+
+    assert isinstance(output["output_value"], pd.Series)
+    assert output["output_value"].empty
+
+
 @pytest.fixture
 def to_iso_format_input_data():
     return {