npm / arborist / #491

push

fix: support system root path with no pkg name

Right now if your cwd is / npm exec, npm ls (or any arborist-dependent
command) will fail with a "could not detect node name from path or
package" error.

This patches add a manual "system-root" name to allow arborist to build
a tree from /

PR-URL: https://github.com/npm/arborist/pull/189
Credit: @ruyadorno
Close: #189
Reviewed-by: @isaacs

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