fix(arborist): handle links with cleared targets - #9820
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Reassigning a node's root clears `target` on every link pointing at it, leaving a link with `isLink` true but no target. Comparing such a link in `matches()` crashed with `TypeError: Cannot read properties of null (reading 'matches')` instead of reporting no match.
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Hit this reifying a pnpm-shaped
node_modules, npm died with:TypeError: Cannot read properties of null (reading 'matches') out of Node.matches()Reassigning a node's root clears target on every link pointing at it, so you can end up with a link where
isLinkis true but target isnull.matches()dereferenced it. Guarding both sides makes a targetless link just not match, which is what the caller wanted anyway. Test builds two links to a shared target and reassigns the target's root to clear both. It throws without the fix.I left the guard inside the existing
this.isLinkbranch rather than restructuring, a plainNodecompared against aLinkstill falls through the same way, so placement and dedupe are untouched.