Vray Material nodes are disconnected after saved if closing and re opening Unreal

Issue reported by Forum user:

https://forums.unrealengine.com/unreal-engine/unreal-studio/1508306-problems-with-unreal-4-20-and-datasmith

Scene was stripped down to only problematic texture.(original scene from 3ds Max)

1) Import Scene attached using Datasmith in Unreal 

Actual result --> Texture was imported (although it is flipped due to negative scaling)

View material graph , everything is connected.

2) Select geometry folder/Mat/texture/Datasmith , right click , Save all 

3) Close Unreal

4) Yes to create Untitled level .

Unreal closes

5) Restart Unreal

6) Double click on the untitled level 

Scene is loaded but image on TV is missing 

7) Click on the TV and view its material 

Material is disconnect 

Fix UE-51650

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