fix init for items with no data

Signed-off-by: Zen <[email protected]>

Author: desultory

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "pycpio"
-version = "0.8.4"
+version = "0.9.0"
 authors = [
   { name="Desultory", email="[email protected]" },
 ]

src/pycpio/cpio/data.py

@@ -181,7 +181,7 @@ def __setattr__(self, name, value):
     def __init__(self, data: bytes, header, *args, **kwargs):
         self.header = header
         self.hash = None
-        self.data = data
+        self.data = data if data is not None else b''
 
     def __str__(self):
         return f"\n{self.header}\nSHA256: {self.hash}\n{self.__class__.__name__}"