Blend Stack node doesn't have a valid FDeltaTimeRecord

The blend stack node doesn't generate any values for its DeltaTimeRecord.  This can be tested with the fix for [Link Removed] shelved at 32747789.  Since there isn't a tick record directly associated with this player type, the node should probably do something like we do in UBlendSpace::TickAssetPlayer where we calculate a normalized value for the delta time record.

1. Integrate the shelf at 32747789
2. Create an anim blueprint
3. Set up a state machine with two states. 
   1. The initial state should contain a blend stack node that plays a single animation.
   2. The second state can just contain an anim sequence
4. Create a transition from the first state to the second state
   1. Set the Automatic Rule Based On Sequence Player In State flag
   2. Set the transit duration to something very small (eg. 0.002)
5. Compile the anim bp
6. The graph will be stuck in the initial state containing the blend stack and never transition to the second state

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