Add sanity check to prevent crashes when Animated Model has NaN in skeleton pose

#2118

Source/Engine/Animations/Graph/AnimGraph.cpp

@@ -282,6 +282,20 @@ void AnimGraphExecutor::Update(AnimGraphInstanceData& data, float dt)
             }
         }
     }
+#if !BUILD_RELEASE
+    {
+        // Perform sanity check on nodes pose to prevent crashes due to NaNs
+        bool anyInvalid = animResult->RootMotion.IsNanOrInfinity();
+        for (int32 i = 0; i < animResult->Nodes.Count(); i++)
+            anyInvalid |= animResult->Nodes.Get()[i].IsNanOrInfinity();
+        if (anyInvalid)
+        {
+            LOG(Error, "Animated Model pose contains NaNs due to animations sampling/blending bug.");
+            context.Data = nullptr;
+            return;
+        }
+    }
+#endif
     SkeletonData* animResultSkeleton = &skeleton;
 
     // Retarget animation when using output pose from other skeleton