Display an error message instead of crashing if the user forgets the -n option with the -O (Dump Chain) option.
Display an error message instead of crashing if the user forgets the -n
option with the -O (Dump Chain) option.

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