If the canned string is "", its no use to the user, make it fall back to the default error string.
If the canned string is "", its no use to the user, make it fall back
to the default error string.


git-svn-id: 193148810cf65385f3a195dbc9a8b504846da3a2@21248 ec53bebd-3082-4978-b11e-865c3cabbd6b

madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal