python: Ensure 'size' & 'download-size' are reported as unknown if None

If the 'size' and 'download-size' are None, set them to MAXUINT64 to
ensure they get reported as 'unknown' in pkcon and other frontends.

Author: joebonrichie

lib/python/packagekit/backend.py

@@ -28,6 +28,8 @@
 import traceback
 import os.path
 
+from gi.repository import GLib
+
 from .enums import *
 
 PACKAGE_IDS_DELIM = '&'
@@ -244,6 +246,13 @@ def details(self, package_id, summary, package_license, group, desc, url, bytes,
         @param bytes: The size of the package, in bytes
         @param download_bytes: The download size of the package, in bytes
         '''
+
+        # Ensure sizes report as 'unknown' in pkcon if not reported
+        if bytes is None:
+            bytes = GLib.MAXUINT64
+        if download_bytes is None:
+            download_bytes = GLib.MAXUINT64
+
         sys.stdout.write(_to_utf8("details\t%s\t%s\t%s\t%s\t%s\t%s\t%ld\t%ld\n" % (package_id, summary, package_license, group, desc, url, bytes, download_bytes)))
         sys.stdout.flush()