[Bug 1411088] [NEW] when clicking on "Erase Disk" get DBus Attribute Error after authenticating

[Andrew Sharp]

Public bug reported:

startup usb-creator-gtk with this command line:

$ usb-creator-gtk -i ~/Desktop/KNOPPIX_V7.2.0CD-2013-06-16-EN.iso
--show-all

A popup window appears (behind all other windows, so you often can't even see it) asking you
to authenticate.  Type in your password, and error window pops up with this text:

org.freedesktop.DBus.Python.AttributeError: Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/dbus/service.py", line 707, in _message_cb
    retval = candidate_method(self, *args, **keywords)
  File "/usr/share/usb-creator/usb-creator-helper", line 218, in Format
    parent_dev = _get_parent_object(udisks, device)
  File "/usr/share/usb-creator/usb-creator-helper", line 49, in _get_parent_object
    parent = partition.get_cached_property('Table').get_string()
AttributeError: 'NoneType' object has no attribute 'get_cached_property'


Application window indicates that it is erasing the disk, but it is not.

Application completely non-functional at this point.

** Affects: usb-creator (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1411088

Title:
  when clicking on "Erase Disk" get DBus Attribute Error after
  authenticating

Status in usb-creator package in Ubuntu:
  New

Bug description:
  startup usb-creator-gtk with this command line:

  $ usb-creator-gtk -i ~/Desktop/KNOPPIX_V7.2.0CD-2013-06-16-EN.iso
  --show-all

  A popup window appears (behind all other windows, so you often can't even see it) asking you
  to authenticate.  Type in your password, and error window pops up with this text:

  org.freedesktop.DBus.Python.AttributeError: Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/dbus/service.py", line 707, in _message_cb
      retval = candidate_method(self, *args, **keywords)
    File "/usr/share/usb-creator/usb-creator-helper", line 218, in Format
      parent_dev = _get_parent_object(udisks, device)
    File "/usr/share/usb-creator/usb-creator-helper", line 49, in _get_parent_object
      parent = partition.get_cached_property('Table').get_string()
  AttributeError: 'NoneType' object has no attribute 'get_cached_property'

  
  Application window indicates that it is erasing the disk, but it is not.

  Application completely non-functional at this point.

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