Fix DQ crashes in MT standard tests
Fixes DQ so that it doesn't crash in threads=1 Reco_tf. (Output not necessarily sensible, and no guarantees about threads>1.) Completes fix for ATLASRECTS-5472.
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Fixes DQ so that it doesn't crash in threads=1 Reco_tf. (Output not necessarily sensible, and no guarantees about threads>1.) Completes fix for ATLASRECTS-5472.