/NS ERASE does not check whether name exists

[tacerus]

Hi,

one can send erase foo and the subsequent confirmation command to NickServ an arbitrary amount of times. I think it may be neat if the program checked if the specified username actually exists or has already been deleted, in order for an administrator to not send the command a lot of times, wondering why it's "not doing anything", especially given the return message is always "Account foo successfully deleted".