npm / cli / #407

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fix: npm outdated parsing invalid specs

This commit fixes a problem in which npm outdated was breaking when
trying to read an invalid semver range spec defined for a given
installed dep by performing the `npm-package-arg` parsing within a
try/catch block instead of expecting to read properties from the
returned instance.

Also, adds the missing test for that specific line of code.

Fixes #1703

PR-URL: https://github.com/npm/cli/pull/1857
Credit: @ruyadorno
Close: #1857
Reviewed-by: @nlf

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