Followup for #27314 to change the type int of the return value of GetDataTypeSizeInBits from int to Optional[int] (#27357)

Author: vivien-apple

scripts/py_matter_idl/matter_idl/generators/types.py

@@ -427,7 +427,7 @@ def IsSignedDataType(data_type: DataType) -> bool:
     return sized_type.is_signed
 
 
-def GetDataTypeSizeInBits(data_type: DataType) -> int:
+def GetDataTypeSizeInBits(data_type: DataType) -> Optional[int]:
     """
     Returns the size in bits for a given data type or None if the data type can not be found.
     """