Assert When Saving Over Existing Level With Built Lighting

While saving over an existing map the engine will crash if both maps have baked lighting.

1. Open a blank project
2. In the default scene change the directional light to static and build lighting
3. Save map as "BaseMap"
4. Open a new map and follow step 2
5. Save over "BaseMap"

RESULT
The engine crashes while attempting to save, with the following messaage in the log:

Fatal error: [Link Removed] [Line: 201] Renaming an object (Package /Temp/Untitled_5_BuiltData) on top of an existing object (Package /Game/_Base_BuiltData) is not allowed

EXPECTED
The current map is saved over the map in the content browser.

UE4Editor_CoreUObject!UObject::Rename() obj.cpp:201
UE4Editor_Engine!UWorld::Rename() world.cpp:507
UE4Editor_UnrealEd!SaveWorld() filehelpers.cpp:556
UE4Editor_UnrealEd!FEditorFileUtils::SaveMap() filehelpers.cpp:2311
UE4Editor_UnrealEd!InternalSavePackage() filehelpers.cpp:2705
UE4Editor_UnrealEd!FEditorFileUtils::PromptForCheckoutAndSave() filehelpers.cpp:3329
UE4Editor_UnrealEd!InternalSavePackages() filehelpers.cpp:2821
UE4Editor_UnrealEd!FEditorFileUtils::SaveDirtyPackages() filehelpers.cpp:3029
UE4Editor_MainFrame!FMainFrameActionCallbacks::SaveAll() mainframeactions.cpp:269
UE4Editor_MainFrame!TBaseStaticDelegateInstance<void __cdecl() delegateinstancesimpl.h:1027
UE4Editor_Slate!FUICommandList::ExecuteAction() uicommandlist.cpp:97
UE4Editor_Slate!SMenuEntryBlock::OnClicked() smenuentryblock.cpp:1041
UE4Editor_Slate!SMenuEntryBlock::OnMenuItemButtonClicked() smenuentryblock.cpp:1001
UE4Editor_Slate!TMemberFunctionCaller<SMenuEntryBlock,FReply() delegateinstanceinterface.h:165
UE4Editor_Slate!TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SMenuEntryBlock,FReply() tuple.h:134
UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SMenuEntryBlock,0,FReply __cdecl() delegateinstancesimpl.h:327
UE4Editor_Slate!TBaseDelegate<FReply>::Execute() delegatesignatureimpl.inl:537
UE4Editor_Slate!SButton::OnMouseButtonUp() sbutton.cpp:278
UE4Editor_Slate!SMenuEntryButton::OnMouseButtonUp() smenuentryblock.cpp:399
UE4Editor_Slate!<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1>::operator() slateapplication.cpp:5075
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1> >() slateapplication.cpp:238
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() slateapplication.cpp:5064
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() slateapplication.cpp:5531
UE4Editor_Slate!FSlateApplication::OnMouseUp() slateapplication.cpp:5508
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() windowsapplication.cpp:1698
UE4Editor_Core!FWindowsApplication::DeferMessage() windowsapplication.cpp:2120
UE4Editor_Core!FWindowsApplication::ProcessMessage() windowsapplication.cpp:867
UE4Editor_Core!FWindowsApplication::AppWndProc() windowsapplication.cpp:714
user32!<Unknown>
user32!<Unknown>
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() windowsplatformmisc.cpp:980
UE4Editor!FEngineLoop::Tick() launchengineloop.cpp:2977
UE4Editor!GuardedMain() launch.cpp:166
UE4Editor!GuardedMainWrapper() launchwindows.cpp:134
UE4Editor!WinMain() launchwindows.cpp:210
UE4Editor!__scrt_common_main_seh() exe_common.inl:264
kernel32!<Unknown>
ntdll!<Unknown>

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