find closest date returns nan for min/max failure as well

pyfacts/utils.py

@@ -188,9 +188,15 @@ def _find_closest_date(
     """
 
     if delta.days < 0 and date < min(data.data):
-        raise DateOutOfRangeError(date, "min")
+        if if_not_found == "nan":
+            return float("NaN"), float("NaN")
+        else:
+            raise DateOutOfRangeError(date, "min")
     if delta.days > 0 and date > max(data.data):
-        raise DateOutOfRangeError(date, "max")
+        if if_not_found == "nan":
+            return float("NaN"), float("NaN")
+        else:
+            raise DateOutOfRangeError(date, "max")
 
     row: tuple = data.get(date, None)
     if row is not None: