bundlebuilder: ignore incorrect pylint warning

pylint isn't smart enough to figure out the return type of Popen.communicate(),
so squelch the warning.

Reviewed-by: James Cameron <quozl@laptop.org>
Acked-by: Simon Schampijer <simon@laptop.org>
CC: Aleksey Lim <alsroot@member.fsf.org>

src/sugar/activity/bundlebuilder.py

@@ -228,6 +228,7 @@ class SourcePackager(Packager):
             return list_files(self.config.source_dir,
                               IGNORE_DIRS, IGNORE_FILES)
 
+        # pylint: disable=E1103
         return [path.strip() for path in stdout.strip('\n').split('\n')]
 
     def package(self):