Jonas Jenwald 5adee0cdd1 [api-minor] Let PDFPageProxy.getStructTree return null, rather than an empty structTree, for documents without any accessibility data (PR 13171 follow-up)
This is first of all consistent with existing API-methods, where we return `null` when the data in question doesn't exist. Secondly, it should also be (slightly) more efficient since there's less dummy-data that we need to transfer between threads.
Finally, this prevents us from adding an empty/unnecessary span to *every* single page even in documents without any structure tree data.
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