Description of problem:
1. go to Custom partitioning
2. remove all existing systems
3. click "Create...automatically"
4. remove the /boot partition

Version-Release number of selected component:
anaconda-21.36-1

The following was filed automatically by anaconda:
anaconda 21.36-1 exception report
Traceback (most recent call first):
  File "/usr/lib64/python2.7/site-packages/parted/disk.py", line 269, in removePartition
    if self.__disk.remove_partition(partition.getPedPartition()):
  File "/usr/lib64/python2.7/site-packages/parted/decorators.py", line 41, in new
    ret = fn(*args, **kwds)
  File "/tmp/updates/blivet/formats/disklabel.py", line 328, in removePartition
    self.partedDisk.removePartition(partition)
  File "/tmp/updates/blivet/devicetree.py", line 431, in _removeDevice
    dev.disk.format.removePartition(dev.partedPartition)
  File "/tmp/updates/blivet/devicetree.py", line 489, in registerAction
    self._removeDevice(action.device)
  File "/tmp/updates/blivet/__init__.py", line 1297, in destroyDevice
    self.devicetree.registerAction(action)
  File "/tmp/updates/pyanaconda/ui/gui/spokes/custom.py", line 1678, in _destroy_device
    self._storage_playground.destroyDevice(device)
  File "/tmp/updates/pyanaconda/ui/gui/spokes/custom.py", line 120, in decorated
    return func(*args, **kwargs)
  File "/tmp/updates/pyanaconda/ui/gui/spokes/custom.py", line 1783, in on_remove_clicked
    self._destroy_device(device)
PartitionException: Partition is not part of the disk it is being removed from

Additional info:
cmdline:        /usr/bin/python  /sbin/anaconda
cmdline_file:   initrd=/test/vpodzime/my_composes/initrd.img root=live:http://cobra02/trees/vp/my_comps_squashfs.img nokill repo=http://cobra02/trees/rawhide/x86_64/os/ lang=en_US.UTF-8 updates=http://cobra02/ks/vp/compose_updates.img BOOT_IMAGE=/test/vpodzime/my_composes/vmlinuz 
executable:     /sbin/anaconda
hashmarkername: anaconda
kernel:         3.15.0-0.rc5.git2.3.fc21.x86_64
product:        Fedora
release:        Cannot get release name.
type:           anaconda
version:        21