[Bug 1740596] Re: set_no_proxy method fails when trying to clear with ""

[David Hewitt]

** Summary changed:

- set_no_proxy method fails
+ set_no_proxy method fails when trying to clear with ""

** Description changed:

- Any call to set_no_proxy via DBus results in the following output:
+ Calls to set_no_proxy with a blank or null new_proxy parameter result in
+ the following output:
  
  'g-io-error-quark:
  GDBus.Error:org.freedesktop.DBus.Python.AttributeError: Traceback (most
  recent call last):\n  File "/usr/lib/python3/dist-
  packages/dbus/service.py", line 707, in _message_cb\n    retval =
  candidate_method(self, *args, **keywords)\n  File "/usr/lib/python3
  /dist-packages/UbuntuSystemService/backend.py", line 287, in
  set_no_proxy\n    res = self._clear_no_proxy()\nAttributeError:
  \'ServiceBackend\' object has no attribute \'_clear_no_proxy\'\n (36)'

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https://bugs.launchpad.net/bugs/1740596

Title:
  set_no_proxy method fails when trying to clear with ""

Status in ubuntu-system-service package in Ubuntu:
  New

Bug description:
  Calls to set_no_proxy with a blank or null new_proxy parameter result
  in the following output:

  'g-io-error-quark:
  GDBus.Error:org.freedesktop.DBus.Python.AttributeError: Traceback
  (most recent call last):\n  File "/usr/lib/python3/dist-
  packages/dbus/service.py", line 707, in _message_cb\n    retval =
  candidate_method(self, *args, **keywords)\n  File "/usr/lib/python3
  /dist-packages/UbuntuSystemService/backend.py", line 287, in
  set_no_proxy\n    res = self._clear_no_proxy()\nAttributeError:
  \'ServiceBackend\' object has no attribute \'_clear_no_proxy\'\n (36)'

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