When there are no messages from Rubocop, exception is raised by the plugin

[arunn]

Traceback (most recent call last):
File "./python3.3/json/decoder.py", line 367, in raw_decode
StopIteration

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/opt/sublime_text/sublime_plugin.py", line 818, in run_
return self.run(edit)
File "/home/arun/.config/sublime-text-3/Packages/RubocopDiffSublime/set_mark.py", line 13, in run
rubocop_offenses = RubocopRunner().run_cmd(file_name)
File "/home/arun/.config/sublime-text-3/Packages/RubocopDiffSublime/rubocop_runner.py", line 12, in run_cmd
json_offenses = json.loads(out.decode('utf-8'))['files'][0]['offenses']
File "./python3.3/json/init.py", line 316, in loads
File "./python3.3/json/decoder.py", line 351, in decode
File "./python3.3/json/decoder.py", line 369, in raw_decode
ValueError: No JSON object could be decoded