assign identity matrices in case of missing pre/postRegTransM
assign identity matrices in case of missing pre/postRegTransM

aditiiyer/CERR,aditiiyer/CERR,aditiiyer/CERR,aditiiyer/CERR,aditiiyer/CERR,cerr/CERR,cerr/CERR,aditiiyer/CERR,cerr/CERR,cerr/CERR,cerr/CERR,cerr/CERR,cerr/CERR,cerr/CERR,aditiiyer/CERR,aditiiyer/CERR,cerr/CERR