ENSWEB-2111: 'off'==blank in ImageConfig land.
ENSWEB-2111: 'off'==blank in ImageConfig land.

Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode