In the `cli`, `getoption` does not offer possible options when run alone as a command

[dannasessha]

In the cli, when running the command getoption by itself the output is:

Error: Need exactly 1 argument

Get a wallet option
Usage:
getoption <optionname>

Which does not offer any possible options to complete the command.

The command setoption when run by itself offers

List of available options:
download_memos : none | wallet | all

which should be included also in the output of getoption.