Fix race in WorkCoordinator when handling document reanalysis #58820
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When we get a request to reanalyze something, we would add that request into a queue; after
a77c37f however we stopped filtering whether the document still existed before passing it around to other parts of the system -- the code here call just GetDocument and check for null. Now we let it pass out and then we get surprised later when we call GetRequiredDocument.
Fixes AB#1431951