Description of problem:
      I was trying to delete a host entry in gwcli. Saw this JSON error when I accidentally entered without a iqn.
This failure should be handled gracefully.

/iscsi-target...eph-igw/hosts> delete client_iqn=
CMD: ../hosts/ delete 
Client DELETE for 
Traceback (most recent call last):
  File "/usr/bin/gwcli", line 187, in <module>
    main()
  File "/usr/bin/gwcli", line 119, in main
    shell.run_interactive()
  File "/usr/lib/python2.7/site-packages/configshell_fb/shell.py", line 905, in run_interactive
    self._cli_loop()
  File "/usr/lib/python2.7/site-packages/configshell_fb/shell.py", line 734, in _cli_loop
    self.run_cmdline(cmdline)
  File "/usr/lib/python2.7/site-packages/configshell_fb/shell.py", line 848, in run_cmdline
    self._execute_command(path, command, pparams, kparams)
  File "/usr/lib/python2.7/site-packages/configshell_fb/shell.py", line 823, in _execute_command
    result = target.execute_command(command, pparams, kparams)
  File "/usr/lib/python2.7/site-packages/configshell_fb/node.py", line 1406, in execute_command
    return method(*pparams, **kparams)
  File "/usr/lib/python2.7/site-packages/gwcli/client.py", line 130, in ui_command_delete
    error_message = api.response.json()['message']
  File "/usr/lib/python2.7/site-packages/requests/models.py", line 802, in json
    return json.loads(self.text, **kwargs)
  File "/usr/lib64/python2.7/json/__init__.py", line 338, in loads
    return _default_decoder.decode(s)
  File "/usr/lib64/python2.7/json/decoder.py", line 366, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib64/python2.7/json/decoder.py", line 384, in raw_decode
    raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded




2017-09-26 14:28:20,251     INFO [_internal.py:87:_log()] - 127.0.0.1 - - [26/Sep/2017 14:28:20] "GET /api/config HTTP/1.1" 200 -
2017-09-26 14:28:20,292     INFO [_internal.py:87:_log()] - 10.70.39.2 - - [26/Sep/2017 14:28:20] "GET /api/_ping HTTP/1.1" 200 -
2017-09-26 14:28:20,304     INFO [_internal.py:87:_log()] - 10.70.39.2 - - [26/Sep/2017 14:28:20] "GET /api/_ping HTTP/1.1" 200 -
2017-09-26 14:28:30,304     INFO [_internal.py:87:_log()] - 10.70.39.2 - - [26/Sep/2017 14:28:30] "GET /api/_ping HTTP/1.1" 200 -
2017-09-26 14:28:35,614     INFO [_internal.py:87:_log()] - 127.0.0.1 - - [26/Sep/2017 14:28:35] "DELETE /api/client/ HTTP/1.1" 404 -

Version-Release number of selected component (if applicable):
ceph-iscsi-config-2.3-8.el7cp.noarch
ceph-iscsi-cli-2.5-7.el7cp.noarch