add dummy Scribd::Document
add dummy Scribd::Document

fixes CNVS-16347

this fixes version deserialization when a version references a scribd
doc

Change-Id: Id29b6ed9080935b35aa1c5905ddea93e330a43a1
Reviewed-on: https://gerrit.instructure.com/43115
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Josh Simpson <bfb4987b134a00f73d881fff5113b1d5fa1876bc@instructure.com>
Product-Review: Cameron Matheson <1d572acbfa68c7c6e541c7b840d6b622e5c0dc91@instructure.com>
QA-Review: Cameron Matheson <1d572acbfa68c7c6e541c7b840d6b622e5c0dc91@instructure.com>

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