Light Complexity view mode crashes if there are hair cards in the scene

The Editor will crash if Groom Hair Cards are viewed with the Light Complexity View Mode.

1. Download the Licensee's test project and open with the debugger attached
https://udn.unrealengine.com/s/contentdocument/069QP00000EZzYRYA1
2. Open the Level "/Game/GroomCrash"
3. Change the view mode to "Light Complexity" (Hotkey: ALT+7)
4. Observe the check():
Assertion failed: Shader.IsValid() [Link Removed] [Line: 211]
Failed to find shader type FDeferredLightPS in Platform PCD3D_SM6

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