Wordpress updated but check not "0"

[wiesel82]

On some wordpress instances I get an error on example-jenkins.py after a successful update.

Traceback (most recent call last):
File "./example-jenkins.py", line 18, in
for area in sorted(updates_input.keys()):
AttributeError: 'int' object has no attribute 'keys'

The browser prints "0" but the source of the checked url is

1. {empty line}
2. {empty line}
3. 0

Problem:
if res == "0": failed
and
for area in sorted(updates_input.keys()): failed too (no keys available)