Safeguard attr access

Author: schloerke

shiny/render/_data_frame_utils/_tbl_data.py

@@ -202,7 +202,7 @@ def serialize_dtype(col: nw.Series) -> FrameDtype:
         type_ = "datetime"
     elif isinstance(dtype, nw.Duration):
         type_ = "duration"
-    elif isinstance(dtype, nw.Time):
+    elif hasattr(nw, "Time") and isinstance(dtype, nw.Time):
         type_ = "time"
     elif isinstance(dtype, nw.Object):
         type_ = "object"