Runtime support for DataOutput causes crash

• There is an assert "item_exists()" coming from QtCore/qtmap.h, gdb backtrace below.

Thread 7 "QSGRenderThread" received signal SIGABRT, Aborted.
0x00007ffff4c5deb5 in raise () from /lib64/libc.so.6
(gdb) bt
#0 0x00007ffff4c5deb5 in raise () at /lib64/libc.so.6
#1 0x00007ffff4c48895 in abort () at /lib64/libc.so.6
#2 0x00007ffff52dbe2c in qErrnoWarning(char const*, ...) () at /home/jakarppi/Qt/5.12.3/gcc_64/bin/../lib/libQt5Core.so.5
#3 0x00007ffff52db52b in qt_assert_x(char const*, char const*, char const*, int) () at /home/jakarppi/Qt/5.12.3/gcc_64/bin/../lib/libQt5Core.so.5
#4 0x00007fffcca51b73 in QMutableMapIterator<QString, qt3ds::runtime::DataOutputDef>::value() (this=0x7fffc51a6770) at /home/jakarppi/Qt/5.12.3/gcc_64/include/QtCore/qmap.h:1293
#5 0x00007fffcca5074d in SApp::NotifyDataOutputs() (this=0x7fffc01bf160) at /home/jakarppi/Work/qt3dstudio/src/Runtime/Source/runtime/Qt3DSApplication.cpp:1027
#6 0x00007fffcca491d7 in SApp::UpdateAndRender() (this=0x7fffc01bf160) at /home/jakarppi/Work/qt3dstudio/src/Runtime/Source/runtime/Qt3DSApplication.cpp:1111
#7 0x00007fffccc9103e in Q3DStudio::CRuntimeView::Render() (this=0x7fffc01ad540) at /home/jakarppi/Work/qt3dstudio/src/Runtime/Source/engine/Qt3DSRuntimeView.cpp:368
#8 0x00007fffcce60378 in Q3DSViewer::Q3DSViewerApp::Render() (this=0x7fffc01ad208) at /home/jakarppi/Work/qt3dstudio/src/Runtime/Source/viewer/Qt3DSViewerApp.cpp:434
#9 0x00007fffdc18a1f2 in Q3DSRenderer::draw() (this=0x7fffc0157bc0) at /home/jakarppi/Work/qt3dstudio/src/Runtime/api/studio3dqml/q3dsrenderer.cpp:163
#10 0x00007fffdc189a09 in Q3DSRenderer::render() (this=0x7fffc0157bc0) at /home/jakarppi/Work/qt3dstudio/src/Runtime/api/studio3dqml/q3dsrenderer.cpp:148
#11 0x00007ffff766ff22 in QSGFramebufferObjectNode::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) [clone .part.7] () at /home/jakarppi/Qt/5.12.3/gcc_64/bin/../lib/libQt5Quick.so.5
#12 0x00007ffff54f4bf9 in QMetaObject::activate(QObject*, int, int, void**) () at /home/jakarppi/Qt/5.12.3/gcc_64/bin/../lib/libQt5Core.so.5
#13 0x00007ffff75418c0 in QQuickWindowPrivate::renderSceneGraph(QSize const&) () at /home/jakarppi/Qt/5.12.3/gcc_64/bin/../lib/libQt5Quick.so.5
#14 0x00007ffff74f135e in QSGRenderThread::syncAndRender() () at /home/jakarppi/Qt/5.12.3/gcc_64/bin/../lib/libQt5Quick.so.5
#15 0x00007ffff74f487c in QSGRenderThread::run() () at /home/jakarppi/Qt/5.12.3/gcc_64/bin/../lib/libQt5Quick.so.5
#16 0x00007ffff52fbe13 in QThreadPrivate::start(void*) () at /home/jakarppi/Qt/5.12.3/gcc_64/bin/../lib/libQt5Core.so.5
#17 0x00007ffff51a95a2 in start_thread () at /lib64/libpthread.so.0
#18 0x00007ffff4d21163 in clone () at /lib64/libc.so.6