os-collect-config fails to start

Issue

• os-collect-config fails to start on controllers
• From journalctl -u os-collect-config

os-collect-config[7384]: ValueError: No JSON object could be decoded
Jun 19 19:21:01 -2 systemd[1]: os-collect-config.service: main process exited, code=exited, status=1/FAILURE
Jun 19 19:21:01 -2 systemd[1]: Unit os-collect-config.service entered failed state.
Jun 19 19:21:01 -2 systemd[1]: os-collect-config.service failed.
Jun 19 19:21:01 -2 systemd[1]: os-collect-config.service holdoff time over, scheduling restart.
Jun 19 19:21:01 -2 systemd[1]: Started Collect metadata and run hook commands..
Jun 19 19:21:01 -2 systemd[1]: Starting Collect metadata and run hook commands....
Jun 19 19:21:02 -2 os-collect-config[8574]: Traceback (most recent call last):
Jun 19 19:21:02 -2 os-collect-config[8574]: File "/usr/bin/os-collect-config", line 10, in <module>
Jun 19 19:21:02 -2 os-collect-config[8574]: sys.exit(__main__())
Jun 19 19:21:02 -2 os-collect-config[8574]: File "/usr/lib/python2.7/site-packages/os_collect_config/collect.py", line 262, in
 __main__
Jun 19 19:21:02 -2 os-collect-config[8574]: collector_kwargs_map=collector_kwargs_map)
Jun 19 19:21:02 -2 os-collect-config[8574]: File "/usr/lib/python2.7/site-packages/os_collect_config/collect.py", line 177, in
 collect_all
Jun 19 19:21:02 -2 os-collect-config[8574]: (changed, path) = cache.store(output_key, output_content)
Jun 19 19:21:02 -2 os-collect-config[8574]: File "/usr/lib/python2.7/site-packages/os_collect_config/cache.py", line 62, in st
ore
Jun 19 19:21:02 -2 os-collect-config[8574]: then_value = json.load(then)
Jun 19 19:21:02 -2 os-collect-config[8574]: File "/usr/lib64/python2.7/json/__init__.py", line 290, in load
Jun 19 19:21:02 -2 os-collect-config[8574]: **kw)
Jun 19 19:21:02 -2 os-collect-config[8574]: File "/usr/lib64/python2.7/json/__init__.py", line 338, in loads
Jun 19 19:21:02 -2 os-collect-config[8574]: return _default_decoder.decode(s)
Jun 19 19:21:02 -2 os-collect-config[8574]: File "/usr/lib64/python2.7/json/decoder.py", line 366, in decode
Jun 19 19:21:02 -2 os-collect-config[8574]: obj, end = self.raw_decode(s, idx=_w(s, 0).end())
Jun 19 19:21:02 -2 os-collect-config[8574]: File "/usr/lib64/python2.7/json/decoder.py", line 384, in raw_decode
Jun 19 19:21:02 -2 os-collect-config[8574]: raise ValueError("No JSON object could be decoded")
Jun 19 19:21:02 -2 os-collect-config[8574]: ValueError: No JSON object could be decoded