Change obmc_boot_test.py to fail on blank state values.

Blank state values indicate that the states could not be obtained.
obmc_boot_test.py must have these values in order to make appropriate
decisions about what boot test to select.

Change-Id: Iff2187a5c1f76eac6926848be097ae4ca15df7a2
Signed-off-by: Michael Walsh <micwalsh@us.ibm.com>
2 files changed