Crash when exporting static mesh actor to FBX (Array index out of bounds)

I set the Forced LOD Model on the mesh component > 1, then tried to export, this is what causes the crash. Here is my suggested fix, we just don't use Git or I'd do a PR:

In the else() branch of FFbxExporter::ExportStaticMesh(), replace the LODIndex definition with the following to clamp it to a valid value:

const int32 LODIndex = (StaticMeshComponent->ForcedLodModel > 0 

? FMath::Min(StaticMesh->GetNumLODs(), StaticMeshComponent->ForcedLodModel) - 1 

: /* auto-select*/ 0);

This crash was encountered when trying to export an entire level, and sometimes artists will mass-set the Forced LOD Model on many components to cause this.

Steps to Reproduce

1. Open TestMap
2. Select SM_SkySphere in the outliner
3. File --> Export Selected...
4. Keep the default options, save the FBX
5. Crash

Assertion failed: (Index >= 0) & (Index < ArrayNum) [Link Removed] [Line: 783]
Array index out of bounds: 1 into an array of size 1

(Crash folder included, but it's so easy to repro this is unnecessary)