Fast Track icon is not displayed when variables is not connected to the AnimGraph

The Fast Track icon is not displayed when there are no variables connected to the AnimGraph.

This issue was not present in UE4.

1. create Third Person Template project
2. open ABP_Manny file
3. add Transform Bone Node in AnimGraph (refer to screenshot)
   Expected : fast track icon is displayed
   Actual Result : fast track icon is not displayed
4. promote 'Alpha' pin to variable
   Result : fast track icon is displayed as expected

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