Ignore empty lines in OWNERS files.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/7003057

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@88341 0039d316-1c4b-4281-b951-d872f2087c98

owners.py

@@ -147,7 +147,7 @@ class Database(object):
     for line in self.fopen(owners_path):
       lineno += 1
       line = line.strip()
-      if line.startswith('#'):
+      if line.startswith('#') or line == '':
         continue
       if line == 'set noparent':
         self.stop_looking.add(dirpath)