...otherwise running e.g. "soffice slot:5410" would crash with

> Invalid read of size 8
>  at 0x712DCCC: SfxItemSet::~SfxItemSet() (svl/source/items/itemset.cxx:317)
>  by 0x65B4990: SfxAllItemSet::~SfxAllItemSet() (include/svl/itemset.hxx:166)
>  by 0x65B2CC4: SfxAllItemSet::~SfxAllItemSet() (include/svl/itemset.hxx:166)
>  by 0x674CD94: SfxDispatchController_Impl::dispatch(com::sun::star::util::URL const&, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&, com::sun::star::uno::Reference<com::sun::star::frame::XDispatchResultListener> const&) (sfx2/source/control/unoctitm.cxx:784)
>  by 0x674CF46: SfxOfficeDispatch::dispatchWithNotification(com::sun::star::util::URL const&, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&, com::sun::star::uno::Reference<com::sun::star::frame::XDispatchResultListener> const&) (sfx2/source/control/unoctitm.cxx:376)
>  by 0x674D03E: non-virtual thunk to SfxOfficeDispatch::dispatchWithNotification(com::sun::star::util::URL const&, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&, com::sun::star::uno::Reference<com::sun::star::frame::XDispatchResultListener> const&) (sfx2/source/control/unoctitm.cxx:378)
>  by 0x4F21028: desktop::DispatchWatcher::executeDispatchRequests(std::__debug::vector<desktop::DispatchWatcher::DispatchRequest, std::allocator<desktop::DispatchWatcher::DispatchRequest> > const&, bool) (desktop/source/app/dispatchwatcher.cxx:581)
>  by 0x4F2CDB3: desktop::OfficeIPCThread::ExecuteCmdLineRequests(desktop::ProcessDocumentsRequest&) (desktop/source/app/officeipcthread.cxx:1061)
>  by 0x4EE3159: desktop::Desktop::OpenClients() (desktop/source/app/app.cxx:2493)
>  by 0x4EE14E7: desktop::Desktop::OpenClients_Impl(void*) (desktop/source/app/app.cxx:2012)
>  by 0x4EE0127: desktop::Desktop::LinkStubOpenClients_Impl(void*, void*) (desktop/source/app/app.cxx:2007)
>  by 0x927B9E6: Link::Call(void*) const (include/tools/link.hxx:123)
>  by 0x999AD8F: ImplHandleUserEvent(ImplSVEvent*) (vcl/source/window/winproc.cxx:1976)
>  by 0x9997E64: ImplWindowFrameProc(Window*, SalFrame*, unsigned short, void const*) (vcl/source/window/winproc.cxx:2591)
>  by 0x99ADCFC: SalFrame::CallCallback(unsigned short, void const*) const (vcl/inc/salframe.hxx:243)
>  by 0x99ACD47: SalGenericDisplay::DispatchInternalEvent() (vcl/generic/app/gendisp.cxx:91)
>  by 0x1783C027: GtkData::userEventFn(void*) (vcl/unx/gtk/app/gtkdata.cxx:935)
>  by 0x1783C13D: call_userEventFn(void*) (vcl/unx/gtk/app/gtkdata.cxx:945)
>  by 0x37B6847E05: g_main_context_dispatch (usr/src/debug/glib-2.36.3/glib/gmain.c:3054)
>  by 0x37B6848157: g_main_context_iterate.isra.22 (usr/src/debug/glib-2.36.3/glib/gmain.c:3701)
>  by 0x37B68481FB: g_main_context_iteration (usr/src/debug/glib-2.36.3/glib/gmain.c:3762)
>  by 0x1783AC3F: GtkData::Yield(bool, bool) (vcl/unx/gtk/app/gtkdata.cxx:576)
>  by 0x1783FEF6: GtkInstance::Yield(bool, bool) (vcl/unx/gtk/app/gtkinst.cxx:425)
>  by 0x9299F40: ImplYield(bool, bool) (vcl/source/app/svapp.cxx:364)
>  by 0x9295B52: Application::Yield() (vcl/source/app/svapp.cxx:396)
>  by 0x9295B1F: Application::Execute() (vcl/source/app/svapp.cxx:345)
>  by 0x4EDE2C9: desktop::Desktop::Main() (desktop/source/app/app.cxx:1715)
>  by 0x92A6397: ImplSVMain() (vcl/source/app/svmain.cxx:162)
>  by 0x92A7B55: SVMain() (vcl/source/app/svmain.cxx:198)
>  by 0x4F35980: soffice_main (desktop/source/app/sofficemain.cxx:85)
>  by 0x40098C: sal_main (desktop/source/app/main.c:48)
>  by 0x400966: main (desktop/source/app/main.c:47)
> Address 0x1d719700 is 0 bytes inside a block of size 32 free'd
>  at 0x4A078DE: operator delete(void*) (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
>  by 0x6A02EA1: CntItemPool::~CntItemPool() (sfx2/source/explorer/nochaos.cxx:123)
>  by 0x6A02C85: CntItemPool::Release() (sfx2/source/explorer/nochaos.cxx:154)
>  by 0x6A02BF8: NoChaos::ReleaseItemPool() (sfx2/source/explorer/nochaos.cxx:89)
>  by 0x65E1A31: SfxApplication::Deinitialize() (sfx2/source/appl/appquit.cxx:147)
>  by 0x65A29B0: SfxApplication::~SfxApplication() (sfx2/source/appl/app.cxx:242)
>  by 0x65A2828: SfxApplication::~SfxApplication() (sfx2/source/appl/app.cxx:223)
>  by 0x65C021C: SfxTerminateListener_Impl::notifyTermination(com::sun::star::lang::EventObject const&) (sfx2/source/appl/appinit.cxx:121)
>  by 0x65C033E: non-virtual thunk to SfxTerminateListener_Impl::notifyTermination(com::sun::star::lang::EventObject const&) (sfx2/source/appl/appinit.cxx:123)
>  by 0x1F176DD2: framework::Desktop::terminate() (framework/source/services/desktop.cxx:353)
>  by 0x1F177E1B: non-virtual thunk to framework::Desktop::terminate() (framework/source/services/desktop.cxx:357)
>  by 0x4F217FD: desktop::DispatchWatcher::dispatchFinished(com::sun::star::frame::DispatchResultEvent const&) (desktop/source/app/dispatchwatcher.cxx:637)
>  by 0x4F2190E: non-virtual thunk to desktop::DispatchWatcher::dispatchFinished(com::sun::star::frame::DispatchResultEvent const&) (desktop/source/app/dispatchwatcher.cxx:640)
>  by 0x674CD77: SfxDispatchController_Impl::dispatch(com::sun::star::util::URL const&, com::sun::star::uno::Sequence<com::sun::star::beans::PropertyValue> const&, com::sun::star::uno::Reference<com::sun::star::frame::XDispatchResultListener> const&) (sfx2/source/control/unoctitm.cxx:782)
>  ...

Change-Id: I6b4fb9b6f0d2afc9caecf3dd5355d11edb6abbe8