Fix #3598 - npm does not warn at installations

This is a regression.

Before with broken fields:
```
(23:30:39) [robert@tequila-apple] ~/footest $ npm install https://github.com/robertkowalski/foo-private/tarball/master
npm http GET https://github.com/robertkowalski/foo-private/tarball/master
npm http 200 https://github.com/robertkowalski/foo-private/tarball/master
foo-private@0.0.0 node_modules/foo-private
```

Fixed:
```
(23:27:53) [robert@tequila-apple] ~/footest $ npm install https://github.com/robertkowalski/foo-private/tarball/master
npm WARN package.json footest@0.0.0 No description
npm WARN package.json footest@0.0.0 No repository field.
npm WARN package.json footest@0.0.0 No README data
npm http GET https://github.com/robertkowalski/foo-private/tarball/master
npm http 200 https://github.com/robertkowalski/foo-private/tarball/master
foo-private@0.0.0 node_modules/foo-private
```