adding error message to console only when error exists
adding error message to console only when error exists

Resolves open-power/hostboot#34

Change-Id: I5febe4f4e8fe6b8a6d0272bf40fce7f284762645
RTC:142083
Reviewed-on: http://gfw160.aus.stglabs.ibm.com:8080/gerrit/22301
Tested-by: Jenkins Server
Reviewed-by: A. Patrick Williams III <c87e37b1a4035affd737b461af89fb722d635f4d@us.ibm.com>
Tested-by: Jenkins OP Build CI
Tested-by: Jenkins OP HW
Tested-by: FSP CI Jenkins
Reviewed-by: Daniel M. Crowell <912029ca9254ac7b5854e56910561d682e1fa2d0@us.ibm.com>

Over-enthusiastic/hostboot,Over-enthusiastic/hostboot,open-power/hostboot,open-power/hostboot,open-power/hostboot,Over-enthusiastic/hostboot,open-power/hostboot,Over-enthusiastic/hostboot,open-power/hostboot,Over-enthusiastic/hostboot