fix bug in PercentTrue primitive

featuretools/primitives/standard/aggregation/percent_true.py

@@ -1,3 +1,4 @@
+import pandas as pd
 from woodwork.column_schema import ColumnSchema
 from woodwork.logical_types import Boolean, BooleanNullable, Double
 
@@ -30,7 +31,7 @@ class PercentTrue(AggregationPrimitive):
     return_type = ColumnSchema(logical_type=Double, semantic_tags={"numeric"})
     stack_on = []
     stack_on_exclude = []
-    default_value = 0
+    default_value = pd.NA
     compatibility = [Library.PANDAS, Library.DASK]
     description_template = "the percentage of true values in {}"
 

featuretools/tests/primitive_tests/aggregation_primitive_tests/test_percent_true.py

@@ -0,0 +1,40 @@
+import pandas as pd
+from woodwork.logical_types import BooleanNullable
+
+import featuretools as ft
+
+
+def test_percent_true_default_value_with_dfs():
+    es = ft.EntitySet(id="customer_data")
+
+    customers_df = pd.DataFrame(data={"customer_id": [1, 2]})
+    transactions_df = pd.DataFrame(
+        data={"tx_id": [1], "customer_id": [1], "is_foo": [True]},
+    )
+
+    es.add_dataframe(
+        dataframe_name="customers_df",
+        dataframe=customers_df,
+        index="customer_id",
+    )
+    es.add_dataframe(
+        dataframe_name="transactions_df",
+        dataframe=transactions_df,
+        index="tx_id",
+        logical_types={"is_foo": BooleanNullable},
+    )
+
+    es = es.add_relationship(
+        "customers_df",
+        "customer_id",
+        "transactions_df",
+        "customer_id",
+    )
+
+    feature_matrix, _ = ft.dfs(
+        entityset=es,
+        target_dataframe_name="customers_df",
+        agg_primitives=["percent_true"],
+    )
+
+    assert pd.isna(feature_matrix["PERCENT_TRUE(transactions_df.is_foo)"][2])