Alembic import causing a crash

Importing this test asset will cause the editor to crash when using any of the Alembic Import options.

I did notice that the source test asset does have 6750 frames but when going through the import process it only registers up to 226. If I open the .abc file in 3DS Max and then export the file again I can get the import to work as intended with all 6750 frames (~62mb for the .abc file, it's in the zip file since it exceeded 50mb).

1. Import attached asset

Regression: No

Results: The test asset will cause the editor to crash.

Expected: The editor should not crash on import.

MachineId:C6108E33411029AE261D0287D9BE352E
EpicAccountId:7c6293d6bf1940c0bc89e1494c5ba9d7

Assertion failed: Pair != nullptr [Link Removed] [Line: 522]

UE4Editor_Core!FText::IsEmpty() [d:\builds\ue4_main\engine\source\runtime\core\private\internationalization\text.cpp:232]
UE4Editor_Core!FSlowTask::GetCurrentMessage() [d:\builds\ue4_main\engine\source\runtime\core\private\misc\slowtask.cpp:96]
UE4Editor_UnrealEd!SSlowTaskWidget::GetProgressText() [d:\builds\ue4_main\engine\source\editor\unrealed\private\feedbackcontexteditor.cpp:301]
UE4Editor_UnrealEd!SSlowTaskWidget::GetMainTextFont() [d:\builds\ue4_main\engine\source\editor\unrealed\private\feedbackcontexteditor.cpp:255]
UE4Editor_UnrealEd!TMemberFunctionCaller<SSlowTaskWidget,FSlateFontInfo (__cdecl SSlowTaskWidget::*)(void)const __ptr64>::operator()<>() [d:\builds\ue4_main\engine\source\runtime\core\public\delegates\delegateinstanceinterface.h:161]
UE4Editor_UnrealEd!TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SSlowTaskWidget,FSlateFontInfo (__cdecl SSlowTaskWidget::*)(void)const __ptr64> >() [d:\builds\ue4_main\engine\source\runtime\core\public\delegates\tuple.h:115]
UE4Editor_UnrealEd!TBaseSPMethodDelegateInstance<1,SSlowTaskWidget,0,FSlateFontInfo __cdecl(void)>::Execute() [d:\builds\ue4_main\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:317]
UE4Editor_Slate!TBaseDelegate<FSlateFontInfo>::Execute() [d:\builds\ue4_main\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:521]
UE4Editor_Slate!TAttribute<FSlateFontInfo>::Get() [d:\builds\ue4_main\engine\source\runtime\core\public\misc\attribute.h:135]
UE4Editor_Slate!STextBlock::GetFont() [d:\builds\ue4_main\engine\source\runtime\slate\private\widgets\text\stextblock.cpp:55]
UE4Editor_Slate!STextBlock::GetComputedTextStyle() [d:\builds\ue4_main\engine\source\runtime\slate\private\widgets\text\stextblock.cpp:289]
UE4Editor_Slate!STextBlock::ComputeDesiredSize() [d:\builds\ue4_main\engine\source\runtime\slate\private\widgets\text\stextblock.cpp:176]
UE4Editor_SlateCore!SWidget::CacheDesiredSize() [d:\builds\ue4_main\engine\source\runtime\slatecore\private\widgets\swidget.cpp:415]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\builds\ue4_main\engine\source\runtime\slatecore\private\widgets\swidget.cpp:403]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\builds\ue4_main\engine\source\runtime\slatecore\private\widgets\swidget.cpp:403]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\builds\ue4_main\engine\source\runtime\slatecore\private\widgets\swidget.cpp:403]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\builds\ue4_main\engine\source\runtime\slatecore\private\widgets\swidget.cpp:403]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\builds\ue4_main\engine\source\runtime\slatecore\private\widgets\swidget.cpp:403]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\builds\ue4_main\engine\source\runtime\slatecore\private\widgets\swidget.cpp:403]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\builds\ue4_main\engine\source\runtime\slatecore\private\widgets\swidget.cpp:403]
UE4Editor_Slate!PrepassWindowAndChildren() [d:\builds\ue4_main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1227]
UE4Editor_Slate!FSlateApplication::DrawPrepass() [d:\builds\ue4_main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1251]
UE4Editor_Slate!FSlateApplication::PrivateDrawWindows() [d:\builds\ue4_main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1317]
UE4Editor_Slate!FSlateApplication::DrawWindows() [d:\builds\ue4_main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1079]
UE4Editor_Slate!FSlateApplication::TickApplication() [d:\builds\ue4_main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1679]
UE4Editor_Slate!FSlateApplication::Tick() [d:\builds\ue4_main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1471]
UE4Editor!FEngineLoop::Tick() [d:\builds\ue4_main\engine\source\runtime\launch\private\launchengineloop.cpp:2877]
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

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