Switch some const char* to std string
Also move the weirdness (empty password is nullptr) close to usage, rather than have it as far away as possible.
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
Also move the weirdness (empty password is nullptr) close to usage, rather than have it as far away as possible.