Alembic Import with empty first frame will cause the editor to crash

The editor will crash when importing an Alembic file with an empty first frame.

1. Import Attached test file
2. Click Import

Results: Editor will crash

Expected: Editor will not crash

Workaround: In the import window set the animation to the first frame with geometry. In this attached files case you 0 is empty. Set it to 1 for the first frame and it will import.

MachineId:C6108E33411029AE261D0287D9BE352E
EpicAccountId:7c6293d6bf1940c0bc89e1494c5ba9d7

Assertion failed: (Index >= 0) & (Index < ArrayNum) [Link Removed] [Line: 833]
Array index out of bounds: 0 from an array of size 0

UE4Editor_Core!FDebug::AssertFailed() [d:\builds\ue4_main\engine\source\runtime\core\private\misc\outputdevice.cpp:421]
UE4Editor_AlembicLibrary!AbcImporterUtilities::RetrieveTypedAbcData<std::shared_ptr<Alembic::Abc::v6::TypedArraySample<Alembic::Abc::v6::P3fTPTraits> >,FVector>() [d:\builds\ue4_main\engine\plugins\experimental\alembicimporter\source\alembiclibrary\private\abcimportutilities.h:108]
UE4Editor_AlembicLibrary!AbcImporterUtilities::GenerateAbcMeshSampleForFrame() [d:\builds\ue4_main\engine\plugins\experimental\alembicimporter\source\alembiclibrary\private\abcimportutilities.h:253]
UE4Editor_AlembicLibrary!FAbcMeshDataImportRunnable::Run() [d:\builds\ue4_main\engine\plugins\experimental\alembicimporter\source\alembiclibrary\private\runnables\abcmeshdataimportrunnable.cpp:82]
UE4Editor_Core!FRunnableThreadWin::Run() [d:\builds\ue4_main\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:74]