Return a clear error when trying to publish a new package with no repository field

[mmalecki]

This is what we return now:

npm info it worked if it ends with ok
npm info using [email protected]
npm info using [email protected]
npm info lifecycle @npm/***@0.0.0~prepublish: @npm/***@0.0.0
npm info attempt registry request try #1 at 16:35:05
npm http request PUT https://***/@npm%2f***
npm http 500 https://***/@npm%2f***
npm info retry will retry, error on last attempt: Error: Cannot read property 'url' of undefined : @npm/***

[marcellodesales]

Have seen the same here!