npm / cli / #1902

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fix: npm ls --long missing deps

Running `npm ls --json --long --all` was broken for any project
containing a missing dependency from the node_modules folder. This
fixes it by avoiding trying to read the extra data required by the
--long option in case a dependency is missing.

Fixes: https://github.com/npm/cli/issues/2724

PR-URL: https://github.com/npm/cli/pull/3119
Credit: @ruyadorno
Close: #3119
Reviewed-by: @wraithgar

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