Description of problem:
I try to install Fedora from running Fedora.  I ran `anaconda --repo=http://download.fedoraproject.org/pub/fedora/linux/releases/23/Workstation/x86_64/os/ --liveinst` and it failed.

Version-Release number of selected component:
anaconda-core-23.19.10-1.fc23.x86_64

The following was filed automatically by anaconda:
anaconda 23.19.10-1 exception report
Traceback (most recent call first):
  File "/usr/lib/python3.4/site-packages/pykickstart/commands/method.py", line 51, in __getattr__
    return getattr(getattr(self.handler, method), name)
  File "/usr/lib/python3.4/site-packages/pykickstart/commands/method.py", line 105, in __getattr__
    return FC3_Method.__getattr__(self, name)
  File "/usr/lib64/python3.4/site-packages/pyanaconda/packaging/livepayload.py", line 77, in setup
    osimg = storage.devicetree.getDeviceByPath(self.data.method.partition)
  File "/usr/lib64/python3.4/site-packages/pyanaconda/packaging/__init__.py", line 1275, in _runThread
    payload.setup(storage, instClass)
  File "/usr/lib64/python3.4/threading.py", line 868, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib64/python3.4/site-packages/pyanaconda/threads.py", line 253, in run
    threading.Thread.run(self, *args, **kwargs)
AttributeError: 'F18_Url' object has no attribute 'partition'

Additional info:
cmdline:        /usr/bin/python3  /usr/sbin/anaconda --repo=http://download.fedoraproject.org/pub/fedora/linux/releases/23/Workstation/x86_64/os/ --liveinst
cmdline_file:   BOOT_IMAGE=/vmlinuz-4.3.3-303.fc23.x86_64 root=PARTUUID=83ef4a27-4446-4543-9250-6fae13a768fb ro rhgb quiet LANG=zh_TW.UTF-8
executable:     /usr/sbin/anaconda
hashmarkername: anaconda
kernel:         4.3.3-303.fc23.x86_64
other involved packages: python3-libs-3.4.3-5.fc23.x86_64, python3-kickstart-2.13-1.fc23.noarch
product:        Fedora
release:        Fedora release 23 (Twenty Three)
type:           anaconda
version:        23