Bug 1212841

Description of problem:
create partition using unused space of the hdd;
format it to ext4;
apply changes -> crash

Version-Release number of selected component:
blivet-gui-0.2.4-1.fc22.noarch

Additional info:
reporter:       libreport-2.5.1
blivet-gui.log: 
cmdline:        /usr/bin/python  /bin/blivet-gui
executable:     /bin/blivet-gui
hashmarkername: blivet-gui
kernel:         4.0.0-1.fc22.x86_64
other involved packages: python-blivet-1.0.7-1.fc22.noarch
product:        Fedora
release:        Fedora release 22 (Twenty Two)
type:           Python
version:        22

Truncated backtrace:
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/blivetgui/blivetgui.py", line 435, in end
    self._raise_exception(error, traceback)
  File "/usr/lib/python2.7/site-packages/blivetgui/blivetgui.py", line 236, in _raise_exception
    raise six.reraise(type(exception), exception, traceback)
  File "/usr/lib/python2.7/site-packages/blivetgui/blivetgui.py", line 442, in do_it
    self.blivet_utils.blivet_do_it()
  File "/usr/lib/python2.7/site-packages/blivetgui/utils.py", line 1210, in blivet_do_it
    self.storage.doIt()
  File "/usr/lib/python2.7/site-packages/blivet/blivet.py", line 162, in doIt
    self.devicetree.processActions(callbacks)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 357, in processActions
    self._preProcessActions()
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 261, in _preProcessActions
    ",".join(problematic))
RuntimeError: partitions in use on disks with changes pending: fedora_bb,fedora_bb-root,luks-602c5a5f-5d6b-49ba-bfc0-d1342a6ecb12,fedora_bb-swap,luks-d2aa1716-77b1-44c8-a37e-9c1242344b65