Distance Field Artifact with Point/Spot Lights with Mesh scaled to 0 on XYZ

When using a Spot/Point Light with Distance Fields enabled and a mesh that is scaled to 0 on the XYZ will result in artifacts.

1. Open UE4
2. Enable Distance Fields in the Project Settings > Rendering >
3. Restart UE4 if DFs not already enabled
4. Place a Point/spot Light in the scene and enable DF Shadows in the details panel
5. Place a Mesh in the scene near the point/spot light
6. Scale the mesh to 0 on the XYZ

Results: With Point/Spot lights there is a noticeable artifact created with meshes that are scaled to 0. This can get larger the further the mesh is from the light source.

Expected: There will not be any artifacts when using DFs with a mesh that is scaled to 0 on the XYZ.

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