Description of problem:
I cclicked on "Edit Device" on blivet-gui and got this error.

Version-Release number of selected component:
blivet-gui-1.0.2-1.fc23.noarch

Additional info:
reporter:       libreport-2.6.3
blivet-gui.log: 
cmdline:        /usr/bin/python3  /usr/bin/blivet-gui
executable:     /usr/bin/blivet-gui
hashmarkername: blivet-gui
kernel:         4.2.6-301.fc23.x86_64
product:        Fedora
release:        Fedora release 23 (Twenty Three)
type:           Python
version:        23

Truncated backtrace:
Traceback (most recent call last):
  File "/usr/lib/python3.4/site-packages/blivetgui/blivetgui.py", line 294, in edit_device
    self.client.remote_call("device_resizable", device),
  File "/usr/lib/python3.4/site-packages/blivetgui/communication/client.py", line 159, in remote_call
    raise type(ret.exception)(str(ret.exception) + "\n" + ret.traceback) # pylint: disable=maybe-no-member
AttributeError: 'BIOSBoot' object has no attribute 'updateSizeInfo'
Traceback (most recent call last):
  File "/usr/lib/python3.4/site-packages/blivetgui/communication/server.py", line 340, in _call_utils_method
    ret = utils_method(*args)
  File "/usr/lib/python3.4/site-packages/blivetgui/blivet_utils.py", line 639, in device_resizable
    blivet_device.format.updateSizeInfo()
AttributeError: 'BIOSBoot' object has no attribute 'updateSizeInfo'