Support package.json upload

[fregante]

This is now supported in the app:

• Don't require name when parsing package.json files npmgraph#260

but the cli still logs this message:

Package at "package.json" needs a name field

while still opening this URL, which breaks the app entirely:

https://npmgraph.js.org/?q=undefined%40undefined#packages=%5B%7B%22dependencies% etc