Description of problem:
As soon as I PXE start anaconda using todays pxe boot images and liveos squashfs (bug 1191713 is fixed), anaconda dies while starting with:
Traceback (most recent call last):
  File "/sbin/anaconda", line 807, in <module>
    anaconda_log.logger.setupVirtio()
  File "/usr/lib64/python2.7/site-packages/pyanaconda/anaconda_log.py", line 241, in setupVirtio
    if not os.access(vport, os.W_OK):
TypeError: coercing to Unicode: need string or buffer, NoneType found

Version-Release number of selected component (if applicable):
anaconda from F22
# anaconda --version
anaconda 22.19-1


How reproducible:
always

Steps to Reproduce:
1. Use vmlinuz, initrd and squash from the F22 dir: https://mirrors.fedoraproject.org/mirrorlist?repo=fedora-22&arch=x86_64
2. "PXE" boot using:
  qemu-system-x86_64 -enable-kvm \
	-vnc 0.0.0.0:693 \
	-serial stdio \
	-smp 4 -m 2048 \
	-hda rootfs.qcow2 \
	-kernel vmlinuz \
	-initrd initrd.img \
	-device virtio-serial -chardev file,id=logfile,path=anaconda.log -device virtserialport,name=org.fedoraproject.anaconda.log.0,chardev=logfile \
	-append "console=ttyS0 inst.ks=http://10.0.2.2:53048/kickstarts/rootfs.ks inst.stage2=http://10.0.2.2:53048/ quiet cmdline inst.virtiolog " ; \

3. See anaconda crashing

Actual results:
anaconda crashes with a traceback when it starts

Expected results:
anaconda comes up and does the installation

Additional info: