fix(commands/request) return err when unable to load config/node due to
nil function

cc @jbenet @mappum

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>
style(commands/cli/helptext) use helper function to cut down on
boilerplate

I know you'll love this one @mappum

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>