Exporting Alembic Skeletal mesh from UE4 to FBX causes a crash

Exporting an alembic skeletal mesh that has been imported and then exporting it to FBX using the asset actions options will cause a crash.

Tested with:
Crash - 4.13.0 Binary CL-3106830
Crash - 4.14 Dev-Framework - CL-3144903

1. Import an alembic file and set the import type to Skeletal (sample asset attached)
2. Right-click on the asset in the Content Browser after import
3. Select Asset Actions > Export
4. Give the file a name and save

Regression: No

Results: The editor will crash

Expected: Crash should not happen.

MachineId:C6108E33411029AE261D0287D9BE352E
EpicAccountId:7c6293d6bf1940c0bc89e1494c5ba9d7

Assertion failed: (Index >= 0) & (Index < ArrayNum) [Link Removed] [Line: 634]
Array index out of bounds: 176 from an array of size 1

UE4Editor_Core!FDebug::AssertFailed() [d:\builds\ue4_main\engine\source\runtime\core\private\misc\assertionmacros.cpp:332]
UE4Editor_UnrealEd!UnFbx::FFbxExporter::BindMeshToSkeleton() [d:\builds\ue4_main\engine\source\editor\unrealed\private\fbx\fbxskeletalmeshexport.cpp:319]
UE4Editor_UnrealEd!UnFbx::FFbxExporter::ExportSkeletalMeshToFbx() [d:\builds\ue4_main\engine\source\editor\unrealed\private\fbx\fbxskeletalmeshexport.cpp:499]
UE4Editor_UnrealEd!UnFbx::FFbxExporter::ExportSkeletalMesh() [d:\builds\ue4_main\engine\source\editor\unrealed\private\fbx\fbxmainexport.cpp:977]
UE4Editor_UnrealEd!USkeletalMeshExporterFBX::ExportBinary() [d:\builds\ue4_main\engine\source\editor\unrealed\private\editorexporters.cpp:1808]
UE4Editor_Engine!UExporter::ExportToArchive() [d:\builds\ue4_main\engine\source\runtime\engine\private\unrealexporter.cpp:110]
UE4Editor_Engine!UExporter::ExportToFileEx() [d:\builds\ue4_main\engine\source\runtime\engine\private\unrealexporter.cpp:414]
UE4Editor_UnrealEd!ObjectTools::ExportObjects() [d:\builds\ue4_main\engine\source\editor\unrealed\private\objecttools.cpp:3421]
UE4Editor_ContentBrowser!FAssetContextMenu::ExecuteExport() [d:\builds\ue4_main\engine\source\editor\contentbrowser\private\assetcontextmenu.cpp:1936]
UE4Editor_ContentBrowser!TBaseSPMethodDelegateInstance<0,FAssetContextMenu,0,TTypeWrapper<void> __cdecl(void)>::Execute() [d:\builds\ue4_main\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:318]
UE4Editor_ContentBrowser!TBaseSPMethodDelegateInstance<0,FAssetContextMenu,0,void __cdecl(void)>::ExecuteIfSafe() [d:\builds\ue4_main\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:424]
UE4Editor_Slate!SMenuEntryBlock::OnClicked() [d:\builds\ue4_main\engine\source\runtime\slate\private\framework\multibox\smenuentryblock.cpp:1045]
UE4Editor_Slate!SMenuEntryBlock::OnMenuItemButtonClicked() [d:\builds\ue4_main\engine\source\runtime\slate\private\framework\multibox\smenuentryblock.cpp:996]
UE4Editor_Slate!TMemberFunctionCaller<SMenuEntryBlock,FReply (__cdecl SMenuEntryBlock::*)(void) __ptr64>::operator()<>() [d:\builds\ue4_main\engine\source\runtime\core\public\delegates\delegateinstanceinterface.h:161]
UE4Editor_Slate!TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SMenuEntryBlock,FReply (__cdecl SMenuEntryBlock::*)(void) __ptr64> >() [d:\builds\ue4_main\engine\source\runtime\core\public\delegates\tuple.h:116]
UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SMenuEntryBlock,0,FReply __cdecl(void)>::Execute() [d:\builds\ue4_main\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:318]
UE4Editor_Slate!TBaseDelegate<FReply>::Execute() [d:\builds\ue4_main\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:522]
UE4Editor_Slate!SButton::OnMouseButtonUp() [d:\builds\ue4_main\engine\source\runtime\slate\private\widgets\input\sbutton.cpp:279]
UE4Editor_Slate!SMenuEntryButton::OnMouseButtonUp() [d:\builds\ue4_main\engine\source\runtime\slate\private\framework\multibox\smenuentryblock.cpp:394]
UE4Editor_Slate!<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1>::operator()() [d:\builds\ue4_main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5002]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1> >() [d:\builds\ue4_main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:215]
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [d:\builds\ue4_main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4991]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [d:\builds\ue4_main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5454]
UE4Editor_Slate!FSlateApplication::OnMouseUp() [d:\builds\ue4_main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5431]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [d:\builds\ue4_main\engine\source\runtime\core\private\windows\windowsapplication.cpp:1639]
UE4Editor_Core!FWindowsApplication::DeferMessage() [d:\builds\ue4_main\engine\source\runtime\core\private\windows\windowsapplication.cpp:1985]
UE4Editor_Core!FWindowsApplication::ProcessMessage() [d:\builds\ue4_main\engine\source\runtime\core\private\windows\windowsapplication.cpp:750]
UE4Editor_Core!FWindowsApplication::AppWndProc() [d:\builds\ue4_main\engine\source\runtime\core\private\windows\windowsapplication.cpp:672]
user32
user32
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [d:\builds\ue4_main\engine\source\runtime\core\private\windows\windowsplatformmisc.cpp:889]
UE4Editor!FEngineLoop::Tick() [d:\builds\ue4_main\engine\source\runtime\launch\private\launchengineloop.cpp:2796]
UE4Editor!GuardedMain() [d:\builds\ue4_main\engine\source\runtime\launch\private\launch.cpp:156]
UE4Editor!GuardedMainWrapper() [d:\builds\ue4_main\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() [d:\builds\ue4_main\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]
kernel32
ntdll