Crash when using SetSkinWeightProfile when using unlimited bone weights.

Licensee is reporting a crash when they are calling SetSkinWeightProfile.

> UnrealEditor-Engine-Win64-Debug.dll!FSkinWeightLookupVertexBuffer::GetWeightOffsetAndInfluenceCount(unsigned int VertexIndex, unsigned int & OutWeightOffset, unsigned int & OutInfluenceCount) Line 185 C++
UnrealEditor-Engine-Win64-Debug.dll!FSkinWeightVertexBuffer::GetVertexInfluenceOffsetCount(unsigned int VertexIndex, unsigned int & VertexWeightOffset, unsigned int & VertexInfluenceCount) Line 746 C++
UnrealEditor-Engine-Win64-Debug.dll!FRuntimeSkinWeightProfileData::ApplyOverrides(FSkinWeightVertexBuffer * OverrideBuffer, const unsigned char * DataBuffer, const int NumVerts) Line 806 C++
UnrealEditor-Engine-Win64-Debug.dll!FSkinWeightProfilesData::InitialiseProfileBuffer(const FName & ProfileName) Line 732 C++
UnrealEditor-Engine-Win64-Debug.dll!FSkinWeightProfileManagerAsyncTask::DoTask(ENamedThreads::Type CurrentThread, const TRefCountPtr<FGraphEvent> & MyCompletionGraphEvent) Line 339 C++
UnrealEditor-Engine-Win64-Debug.dll!TGraphTask<FSkinWeightProfileManagerAsyncTask>::ExecuteTask(TArray<FBaseGraphTask *,TSizedDefaultAllocator<32>> & NewTasks, ENamedThreads::Type CurrentThread, bool bDeleteOnCompletion) Line 1237 C++
UnrealEditor-Core-Win64-Debug.dll!FNamedTaskThread::ProcessTasksNamedThread(int QueueIndex, bool bAllowStall) Line 760 C++
UnrealEditor-Core-Win64-Debug.dll!FNamedTaskThread::ProcessTasksUntilQuit(int QueueIndex) Line 651 C++
UnrealEditor-Core-Win64-Debug.dll!FTaskGraphCompatibilityImplementation::ProcessThreadUntilRequestReturn(ENamedThreads::Type CurrentThread) Line 2069 C++
UnrealEditor-Core-Win64-Debug.dll!FTaskGraphCompatibilityImplementation::WaitUntilTasksComplete(const TArray<TRefCountPtr<FGraphEvent>,TSizedInlineAllocator<4,32,TSizedDefaultAllocator<32>>> & Tasks, ENamedThreads::Type CurrentThreadIfKnown) Line 2122 C++
UnrealEditor-Engine-Win64-Debug.dll!FTickTaskSequencer::ReleaseTickGroup(ETickingGroup WorldTickGroup, bool bBlockTillComplete) Line 556 C++
UnrealEditor-Engine-Win64-Debug.dll!FTickTaskManager::RunTickGroup(ETickingGroup Group, bool bBlockTillComplete) Line 1583 C++
UnrealEditor-Engine-Win64-Debug.dll!UWorld::RunTickGroup(ETickingGroup Group, bool bBlockTillComplete) Line 775 C++
UnrealEditor-Engine-Win64-Debug.dll!UWorld::Tick(ELevelTick TickType, float DeltaSeconds) Line 1519 C++
UnrealEditor-Kismet-Win64-Debug.dll!FSCSEditorViewportClient::Tick(float DeltaSeconds) Line 257 C++
UnrealEditor-UnrealEd-Win64-Debug.dll!UEditorEngine::Tick(float DeltaSeconds, bool bIdleMode) Line 2111 C++
UnrealEditor-UnrealEd-Win64-Debug.dll!UUnrealEdEngine::Tick(float DeltaSeconds, bool bIdleMode) Line 550 C++