fix(Runtime): Check IsFinite on input position when fixing bones in LateUpdate

Summary: It might be possible that the retargeted's characters bones might not have valid positions when they are being corrected in LateUpdate. This code checks that before doing the LateUpdate correction.

Reviewed By: andkim-meta

Differential Revision: D48048967

fbshipit-source-id: 2b6ffdd8d6af3fac9129074d60861f1de640dca0

Author: sohailshafiiWk

Runtime/Scripts/AnimationRigging/RetargetingLayer.cs

@@ -475,8 +475,14 @@ private void CorrectPositions()
                 var positionOffset = _applyAnimationConstraintsToCorrectedPositions ?
                     JointPositionAdjustments[(int)humanBodyBone].GetPositionOffset() : Vector3.zero;
                 var oldPosition = targetJoint.position;
-                float rtWeight = _retargetingAnimationConstraint.weight;
+                // Make sure the joint position is valid before fixing it.
+                if (!RiggingUtilities.IsFiniteVector3(oldPosition))
+                {
+                    continue;
+                }
 
+                float rtWeight = _retargetingAnimationConstraint.weight;
+                
                 if (adjustment == null)
                 {
                     targetJoint.position =