Report invalid key when key import fails.  Do not go on and use invalid key handle.  Bug 283642.  r=relyea
Report invalid key when key import fails.  Do not go on and use invalid
key handle.  Bug 283642.  r=relyea

nmav/nss,ekr/nss-old,ekr/nss-old,nmav/nss,ekr/nss-old,nmav/nss,ekr/nss-old,ekr/nss-old,nmav/nss,ekr/nss-old,ekr/nss-old,nmav/nss,nmav/nss,nmav/nss