[w3c/IndexedDB] IDBTransaction's error attribute should be nullable (#313)

This was missed in 8d5d66b171608c326cd272f03c888dd854263319

Closes #312 

* Just an IDL oversight - the prose was already correct.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/IndexedDB/pull/313

-- Commit Summary --

  * IDBTransaction's error attribute should be nullable

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/w3c/IndexedDB/pull/313.patch
https://github.com/w3c/IndexedDB/pull/313.diff

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