[CrashReport] UE4Editor_Engine!FDistanceFieldAsyncQueue::Build()

This is a common crash callstack that has affected more than 300 unique users since at least the 4.11 release. Other Jiras in the past with similar callstacks include [Link Removed] and [Link Removed].

User Descriptions

• Importing an asset from PyroParticlePack into a project with distance fields enabled?
• Importing a marketplace asset
• I opened my project, the edior promted me to import a static mesh; I closed the window, ignoring the import, and the editor crashed.

Source Context

 779       void FDistanceFieldAsyncQueue::Build(FAsyncDistanceFieldTask* Task, FQueuedThreadPool& ThreadPool)
  780       {
  781       #if WITH_EDITOR
  782 ***** 	const FStaticMeshLODResources& LODModel = Task->GenerateSource->RenderData->LODResources[0];
  783       
  784       	MeshUtilities->GenerateSignedDistanceFieldVolumeData(
  785       		Task->StaticMesh->GetName(),
  786       		LODModel,
  787       		ThreadPool,
  788       		Task->MaterialBlendModes,
  789       		Task->GenerateSource->RenderData->Bounds,
  790       		Task->DistanceFieldResolutionScale,
  791       		Task->bGenerateDistanceFieldAsIfTwoSided,
  792       		*Task->GeneratedVolumeData);
  793       
  794       	CompletedTasks.Push(Task);
  795       #endif
  796       }

1) Open QAGame in editor through UGS //UE4/Dev-Editor  (CL 4272083)

2) In the Content Browser find the animation sequence asset rotatingaxis_anim. Drag it into the Viewport.

3) Click the Import button in the Content Browser. Navigate to \Engine\Content\NotForLicensees\QA\Import_Test_Assets\AlembicAssets and select rotating_axis_maya.abc  Click Open.

4) Ensure that the Import Type is set to Static Mesh. Scroll down to the Conversion section and ensure that Preset is set to Autodesk Maya.

5) Click Import.

6) Drag rotating_axis_maya into the Viewport.

7) Click the Import button in the Content Browser. Select rotating_axis_max.ABC  Click Open.

8) Scroll down to the Conversion section and change Preset to Autodesk 3ds Max.

9) Click Import.

Expected result: file imports into content browser as new item unsaved item.

Actual result: Editor crashes.  

Fix UE-51650

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