dominictarr/npmd — pull request #84 by nickleefly (2014-12-29 10:27:45+00:00)
Title: check if argument specified

```
$ node index.js
npmd
install, resolve, ls, tree, help
undefined
```

after this commit
result for `$ node index.js`

```
npmd
install, resolve, ls, tree, help
```