GDScript: crash when autocompleting with signal

[ThakeeNathees]

Godot version: v4.0.dev.custom_build 35ff38b

OS/device including version: windows 10

Issue description:

signal member_signal
class MemberClass:
    var x = ## <-- autocompletion crash here

signal member_signal
func ready():
    self.some_method( ## <-- autocompletion crash here

backtrace

[0] CowData<GDScriptParser::ClassNode::Member>::_get_size (C:\dev\__test_env\godot\core\cowdata.h:70)
[1] CowData<GDScriptParser::ClassNode::Member>::size (C:\dev\__test_env\godot\core\cowdata.h:127)
[2] Vector<GDScriptParser::ClassNode::Member>::size (C:\dev\__test_env\godot\core\vector.h:87)
[3] _find_identifiers_in_class (C:\dev\__test_env\godot\modules\gdscript\gdscript_editor.cpp:776)
[4] _find_identifiers (C:\dev\__test_env\godot\modules\gdscript\gdscript_editor.cpp:1020)
[5] GDScriptLanguage::complete_code (C:\dev\__test_env\godot\modules\gdscript\gdscript_editor.cpp:2471)
[6] ScriptTextEditor::_code_complete_script (C:\dev\__test_env\godot\editor\plugins\script_text_editor.cpp:705)
[7] ScriptTextEditor::_code_complete_scripts (C:\dev\__test_env\godot\editor\plugins\script_text_editor.cpp:694)
[8] CodeTextEditor::_complete_request (C:\dev\__test_env\godot\editor\code_editor.cpp:835)
[9] call_with_variant_args_helper<CodeTextEditor> (C:\dev\__test_env\godot\core\callable_method_pointer.h:136)
[10] call_with_variant_args<CodeTextEditor> (C:\dev\__test_env\godot\core\callable_method_pointer.h:158)
[11] CallableCustomMethodPointer<CodeTextEditor>::call (C:\dev\__test_env\godot\core\callable_method_pointer.h:185)
[12] Callable::call (C:\dev\__test_env\godot\core\callable.cpp:50)
[13] Object::emit_signal (C:\dev\__test_env\godot\core\object.cpp:1077)
[14] Object::emit_signal (C:\dev\__test_env\godot\core\object.cpp:1132)
[15] TextEdit::query_code_comple (C:\dev\__test_env\godot\scene\gui\text_edit.cpp:6383)
[16] CodeTextEditor::_code_complete_timer_timeout (C:\dev\__test_env\godot\editor\code_editor.cpp:825)
[17] call_with_variant_args_helper<CodeTextEditor> (C:\dev\__test_env\godot\core\callable_method_pointer.h:136)
[18] call_with_variant_args<CodeTextEditor> (C:\dev\__test_env\godot\core\callable_method_pointer.h:158)
[19] CallableCustomMethodPointer<CodeTextEditor>::call (C:\dev\__test_env\godot\core\callable_method_pointer.h:185)
[20] Callable::call (C:\dev\__test_env\godot\core\callable.cpp:50)
[21] Object::emit_signal (C:\dev\__test_env\godot\core\object.cpp:1077)
[22] Object::emit_signal (C:\dev\__test_env\godot\core\object.cpp:1132)
[23] Timer::_notification (C:\dev\__test_env\godot\scene\main\timer.cpp:61)
[24] Timer::_notificationv (C:\dev\__test_env\godot\scene\main\timer.h:37)
[25] Object::notification (C:\dev\__test_env\godot\core\object.cpp:808)
[26] SceneTree::_notify_group_pause (C:\dev\__test_env\godot\scene\main\scene_tree.cpp:820)
[27] SceneTree::idle (C:\dev\__test_env\godot\scene\main\scene_tree.cpp:446)
[28] Main::iteration (C:\dev\__test_env\godot\main\main.cpp:2333)
[29] OS_Windows::run (C:\dev\__test_env\godot\platform\windows\os_windows.cpp:627)
[30] widechar_main (C:\dev\__test_env\godot\platform\windows\godot_windows.cpp:163)
[31] _main (C:\dev\__test_env\godot\platform\windows\godot_windows.cpp:185)
[32] main (C:\dev\__test_env\godot\platform\windows\godot_windows.cpp:199)
[33] __scrt_common_main_seh (d:\A01\_work\6\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288)
[34] BaseThreadInitThunk
-- END OF BACKTRACE --