It is legal for the VarStoreId of a question to
be 0 per the UEFI spec:
"Specifies the identifier of a previously
declared variable store to use when storing the
question’s value. A value of zero indicates
no associated variable store."
Instead of hitting an assert just skip this
question as there is no value to return.
Signed-off-by: Jeff Brasen <jbrasen@nvidia.com>
65b0d08786