Fix Zygote selinux code to support null values
Fix Zygote selinux code to support null values

Change-Id: I05f9189f11ffd6e6d6d32582b051a91845653ad7

treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst