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Fixes: #519
This is a fix for a regression that was introduced in this commit: https://github.com/Shopify/quilt/pull/475/files#diff-68157ac38fbcaa003b546774b1857293R48 on line 48. The bug is that initialValue[index][fieldPath] throws an exception instead of returning undefined the way it previously did when initialValue[index] is undefined. I added an extra check to see if initialValue.index is defined and return undefined if its not.
🎩 it with our form (which has a polymorphic list and uses the List from react-form-state) and now it working instead of throwing an error (relates to #11012).