Switch to the empty script interface and godot forces quit when the tscn scene file with script is loaded

[haizhou37]

Godot version:
godot3.1 alpha2

OS/device including version:
manjaro gnome x64
Intel® Core™ i3-2350M CPU @ 2.30GHz × 4
Intel® Sandybridge Mobile
OpenGL ES 3.0 Renderer: Mesa DRI Intel(R) Sandybridge Mobile
intel hd 3000
4g ram

Issue description:

Steps to reproduce:
1.Open a scene without a script (or not a loaded, empty scene)
2.Switch to script interface
3.Open a scene file with script

Minimal reproduction project:
Test2.zip

[qarmin]

Confirm on Ubuntu 18.10 GTX 970
This is a backtrace

handle_crash: Program crashed with signal 11
Dumping the backtrace. Please include this when reporting the bug on https://github.com/godotengine/godot/issues
[1] /lib/x86_64-linux-gnu/libc.so.6(+0x41100) [0x7fb7a0992100] (??:0)
[2] Map<StringName, VisualScript::Function, Comparator<StringName>, DefaultAllocator>::front() const (??:0)
[3] VisualScript::get_function_list(List<StringName, DefaultAllocator>*) const (??:0)
[4] VisualScriptEditor::_update_members() (??:0)
[5] VisualScriptEditor::_notification(int) (??:0)
[6] VisualScriptEditor::_notificationv(int, bool) (??:0)
[7] Object::notification(int, bool) (??:0)
[8] Control::_notification(int) (??:0)
[9] Control::_notificationv(int, bool) (??:0)
[10] Container::_notificationv(int, bool) (??:0)
[11] BoxContainer::_notificationv(int, bool) (??:0)
[12] VBoxContainer::_notificationv(int, bool) (??:0)
[13] ScriptEditorBase::_notificationv(int, bool) (??:0)
[14] VisualScriptEditor::_notificationv(int, bool) (??:0)
[15] Object::notification(int, bool) (??:0)
[16] CanvasItem::_enter_canvas() (??:0)
[17] CanvasItem::_notification(int) (??:0)
[18] CanvasItem::_notificationv(int, bool) (??:0)
[19] Control::_notificationv(int, bool) (??:0)
[20] Container::_notificationv(int, bool) (??:0)
[21] BoxContainer::_notificationv(int, bool) (??:0)
[22] VBoxContainer::_notificationv(int, bool) (??:0)
[23] ScriptEditorBase::_notificationv(int, bool) (??:0)
[24] VisualScriptEditor::_notificationv(int, bool) (??:0)
[25] Object::notification(int, bool) (??:0)
[26] Node::_propagate_enter_tree() (??:0)
[27] Node::_set_tree(SceneTree*) (??:0)
[28] Node::_add_child_nocheck(Node*, StringName const&) (??:0)
[29] Node::add_child(Node*, bool) (??:0)
[30] ScriptEditor::edit(Ref<Resource> const&, int, int, bool) (??:0)
[31] ScriptEditor::edit(Ref<Resource> const&, bool) (??:0)
[32] ScriptEditor::set_scene_root_script(Ref<Script>) (??:0)
[33] EditorNode::_set_main_scene_state(Dictionary, Node*) (??:0)
[34] MethodBind2<Dictionary, Node*>::call(Object*, Variant const**, int, Variant::CallError&) (??:0)
[35] Object::call(StringName const&, Variant const**, int, Variant::CallError&) (??:0)
[36] MessageQueue::_call_function(Object*, StringName const&, Variant const*, int, bool) (??:0)
[37] MessageQueue::flush() (??:0)
[38] SceneTree::iteration(float) (??:0)
[39] Main::iteration() (??:0)
[40] OS_X11::run() (??:0)
[41] /home/rafal/Pulpit/godot/bin/godot.x11.tools.64(main+0xdc) [0x55fa6a36e441] (??:0)
[42] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xeb) [0x7fb7a097509b] (??:0)
[43] /home/rafal/Pulpit/godot/bin/godot.x11.tools.64(_start+0x2a) [0x55fa6a36e2aa] (??:0)
-- END OF BACKTRACE --

_{(bugsquad edit: made the backtrace a codeblock)}

[akien-mga]

CC @fire

[fire]

Will look into it tomorrow.

[fire]

#23535