npm / cli / #573

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view: Better errors when package.json is not JSON

Previously, `npm view <noargs>` was just saying "Invalid package.json"
if the package.json file was not JSON, or if it was missing.

This errors out with the appropriate error in these cases.

Also, no need to read the big clunky 'read-package-json' for this, we're
literally just checking for a single field.  We can be a bit more
efficient here.

1880 of 2934 branches covered (64.08%)

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6 of 6 new or added lines in 1 file covered. (100.0%)

3644 of 5161 relevant lines covered (70.61%)

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