Editor crash when resetting a Typed Array without an initial value

[c0rrup7eq]

Godot version:
v3.1.stable.official

OS/device including version:
Windows 10 Home

Issue description:
If an exported array is declared with a type but without an initial value, then if you try to reset it to the original value in the Editor, it crashes the program.

It was mentioned in #24134 in the comments, but I haven't found a separate issue for this bug.
#24134 (comment)

Steps to reproduce:

1. Create a new project
2. Create a Node
3. Attach a script and add export var array : Array to it
4. Save and change the array in the editor
5. Reset the array

Minimal reproduction project:
Array Test.zip

[c0rrup7eq]

Fixed attached project for a correct one.

Also the crash doesn't happen with export var array : Array = Array() and resets as intended.

[qarmin]

Backtrace:

[1] /lib/x86_64-linux-gnu/libc.so.6(+0x3ef20) [0x7f31b2d05f20] (??:0)
[2] Object::notification(int, bool) (/home/rafal/Pulpit/godot/core/object.cpp:955)
[3] Object::_predelete() (/home/rafal/Pulpit/godot/core/object.cpp:387)
[4] predelete_handler(Object*) (/home/rafal/Pulpit/godot/core/object.cpp:2011)
[5] void memdelete<VBoxContainer>(VBoxContainer*) (/home/rafal/Pulpit/godot/./core/os/memory.h:117)
[6] EditorPropertyArray::update_property() (/home/rafal/Pulpit/godot/editor/editor_properties_array_dict.cpp:261)
[7] EditorInspector::_notification(int) (/home/rafal/Pulpit/godot/editor/editor_inspector.cpp:2188)
[8] EditorInspector::_notificationv(int, bool) (/home/rafal/Pulpit/godot/editor/editor_inspector.h:251 (discriminator 14))
[9] Object::notification(int, bool) (/home/rafal/Pulpit/godot/core/object.cpp:954)
[10] SceneTree::_notify_group_pause(StringName const&, int) (/home/rafal/Pulpit/godot/scene/main/scene_tree.cpp:969)
[11] SceneTree::idle(float) (/home/rafal/Pulpit/godot/scene/main/scene_tree.cpp:518 (discriminator 3))
[12] Main::iteration() (/home/rafal/Pulpit/godot/main/main.cpp:1886)
[13] OS_X11::run() (/home/rafal/Pulpit/godot/platform/x11/os_x11.cpp:3006)
[14] /usr/bin/godot(main+0xdc) [0x1167183] (/home/rafal/Pulpit/godot/platform/x11/godot_x11.cpp:56)
[15] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0x7f31b2ce8b97] (??:0)
[16] /usr/bin/godot(_start+0x2a) [0x1166fea] (??:?)