Conveniency about parameter "argsDescription" in program.description()

[ltccss]

In my case, some arguments of a command are not necessary to describe, but currently I have to write all descriptions of them to avoid the null reference error.

I think it may be more pleasant to make a null check for "argsDescription[arg.name]" here?

commander.js/index.js

Line 1551 in 1b5ede8

desc.push(' ' + pad(arg.name, width) + ' ' + wrap(argsDescription[arg.name], descriptionWidth, width + 4));

[shadowspawn]

Reasonable suggestion.

(This is the second ever issue opened for the undocumented argsDescription parameter to .description()!)

[shadowspawn]

Released in Commander v6.1
https://github.com/tj/commander.js/releases/tag/v6.1.0