How to reproduce

1. Put the code below in index.js, install commander, run node index.js
2. Result: error: missing required argument 'some'
3. Change command inspect to someothercommand
4. Result: Actual log of the commander object

var program = require('commander');

program
  .command('inspect <some>')
  .description('Test bug')
  .action(function(some, options) {});

console.log(program);