### Godot version

3b086aa06

### System information

ArchLinux x11

### Issue description

```gdscript
extends Node

@export_group("My Properties")
@export var number = 3
@export var string = ""

@export_group("Prefixed Properties", "prefix_")
@export var prefix_number = 3
@export var prefix_string = ""

@export_group("", "")
@export var ungrouped_number = 3
```

![image](https://user-images.githubusercontent.com/70787919/214983963-528c415b-745b-47fc-9777-36ebe31a3060.png)


### Steps to reproduce

- create script
- @export_group
- go inspector

### Minimal reproduction project

‮
push_text("Assert ( ");
	print_expression(p_assert->condition);
	push_line(" )");
}
void GDScriptParser::TreePrinter::print_assignment(AssignmentNode *p_assignment) {
	switch (p_assignment->assignee->type) {
		case Node::IDENTIFIER:
			print_identifier(static_cast<IdentifierNode *>(p_assignment->assignee));
			break;
		case Node::SUBSCRIPT:
			print_subscript(static_cast<SubscriptNode *>(p_assignment->assignee));
			break;
		default:
			break; 
	}
	push_text(" ");
	switch (p_assignment->operation) {
		case AssignmentNode::OP_ADDITION:
			push_text("+");
			break;
		case AssignmentNode::OP_SUBTRACTION:
			push_text("-");
			break;
		case AssignmentNode::OP_MULTIPLICATION:
			push_text("*");
			break;
		case AssignmentNode::OP_DIVISION:
			push_text("/");