Executing VisualShader.new()._input_type_changed(10,10) crashes Godot

[qarmin]

Godot version:
Godot 3.2.4 rc 2

Issue description:
Executing

VisualShader.new()._input_type_changed(10,10)

crashes with backtrace

scene/resources/visual_shader.cpp:1450:26: runtime error: index 10 out of bounds for type 'Graph [3]'
=================================================================
==151813==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x61700009ae48 at pc 0x00000b046649 bp 0x7ffeb9aef120 sp 0x7ffeb9aef110
READ of size 8 at 0x61700009ae48 thread T0
    #0 0xb046648 in List<VisualShader::Connection, DefaultAllocator>::front() core/list.h:196
    #1 0xf2b65af in VisualShader::_input_type_changed(VisualShader::Type, int) scene/resources/visual_shader.cpp:1452
    #2 0xf3543f6 in MethodBind2<VisualShader::Type, int>::call(Object*, Variant const**, int, Variant::CallError&) core/method_bind.gen.inc:1523
    #3 0x1130f551 in Object::call(StringName const&, Variant const**, int, Variant::CallError&) core/object.cpp:919
    #4 0x1130d30c in Object::callv(StringName const&, Array const&) core/object.cpp:825
    #5 0x11374bfd in MethodBind2R<Variant, StringName const&, Array const&>::call(Object*, Variant const**, int, Variant::CallError&) core/method_bind.gen.inc:1717
    #6 0x1130f551 in Object::call(StringName const&, Variant const**, int, Variant::CallError&) core/object.cpp:919
    #7 0x1159052d in Variant::call_ptr(StringName const&, Variant const**, int, Variant*, Variant::CallError&) core/variant_call.cpp:1129
    #8 0x1d4c957 in GDScriptFunction::call(GDScriptInstance*, Variant const**, int, Variant::CallError&, GDScriptFunction::CallState*) modules/gdscript/gdscript_function.cpp:1086
    #9 0x1b7c6af in GDScriptInstance::call(StringName const&, Variant const**, int, Variant::CallError&) modules/gdscript/gdscript.cpp:1238
    #10 0x1130f0c1 in Object::call(StringName const&, Variant const**, int, Variant::CallError&) core/object.cpp:898
    #11 0x1159052d in Variant::call_ptr(StringName const&, Variant const**, int, Variant*, Variant::CallError&) core/variant_call.cpp:1129
    #12 0x1d4c957 in GDScriptFunction::call(GDScriptInstance*, Variant const**, int, Variant::CallError&, GDScriptFunction::CallState*) modules/gdscript/gdscript_function.cpp:1086
    #13 0x1b7d3f9 in GDScriptInstance::_ml_call_reversed(GDScript*, StringName const&, Variant const**, int) modules/gdscript/gdscript.cpp:1269
    #14 0x1b7d6ac in GDScriptInstance::call_multilevel_reversed(StringName const&, Variant const**, int) modules/gdscript/gdscript.cpp:1276
    #15 0xbeee194 in Node::_notification(int) scene/main/node.cpp:149
    #16 0x1a29b69 in Node::_notificationv(int, bool) scene/main/node.h:46
    #17 0x1a2bfde in CanvasItem::_notificationv(int, bool) scene/2d/canvas_item.h:166
    #18 0xd9bcc3a in Node2D::_notificationv(int, bool) scene/2d/node_2d.h:38
    #19 0x1130f9eb in Object::notification(int, bool) core/object.cpp:929
    #20 0xbef0111 in Node::_propagate_ready() scene/main/node.cpp:196
    #21 0xbeef977 in Node::_propagate_ready() scene/main/node.cpp:188
    #22 0xbf3c708 in Node::_set_tree(SceneTree*) scene/main/node.cpp:2557
    #23 0xbfff630 in SceneTree::init() scene/main/scene_tree.cpp:463
    #24 0x178042f in OS_X11::run() platform/x11/os_x11.cpp:3621
    #25 0x16ee466 in main platform/x11/godot_x11.cpp:56
    #26 0x7f67aa0270b2 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
    #27 0x16ee07d in _start (/usr/bin/godots+0x16ee07d)

Address 0x61700009ae48 is a wild pointer.
SUMMARY: AddressSanitizer: heap-buffer-overflow core/list.h:196 in List<VisualShader::Connection, DefaultAllocator>::front()