exception when freeing data

[rpanah]

ERROR: Error running Centinel: local variable 'data' referenced before assignment
Traceback (most recent call last):
  File "/home/xxx/centinel/centinel/vpn/cli.py", line 315, in scan_vpns
    client.run()
  File "/home/xxx/centinel/centinel/client.py", line 209, in run
    self.run_exp(name=python_exp, exp_config=exp_config, schedule_name=name)
  File "/home/xxx/centinel/centinel/client.py", line 416, in run_exp
    del data
UnboundLocalError: local variable 'data' referenced before assignment