fix whitespace mistake introduced by c7a80a1

Signed-off-by: Sascha Silbe <silbe@activitycentral.com>
Acked-by: Simon Schampijer <simon@laptop.org>

src/sugar/bundle/activitybundle.py

@@ -35,6 +35,7 @@ from sugar.bundle.bundle import Bundle, \
 from sugar.bundle.bundleversion import NormalizedVersion
 from sugar.bundle.bundleversion import InvalidVersionError
 
+
 class ActivityBundle(Bundle):
     """A Sugar activity bundle