Do not panic when LUKS password is not early enough

Fix from:
http://git.kernel.org/cgit/boot/dracut/dracut.git/commit/?id=7e4f74f5040fc3f4e7646695b54c5c11b0b95c62
http://git.kernel.org/cgit/boot/dracut/dracut.git/commit/?id=3934ca8e6c0e80ecb32a2ed9403321afd510842e

Problem described here:
https://bugzilla.redhat.com/show_bug.cgi?id=868421

Release: 2