npm / arborist / #842

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Provide currentEdge in ERESOLVE if known

This provides another fail-safe for the CLI to report _something_ useful
to the user when an ERESOLVE happens, if by some brokenness in our tree
handling we don't have the node in the tree somehow to provide a current
or peerConflict.

PR-URL: https://github.com/npm/arborist/pull/259
Credit: @isaacs
Close: #259
Reviewed-by: @nlf

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