### Godot version

4.1.beta (7b1387ff2)

### System information

Mageia 9, Linux

### Issue description

When opening an empty project in latest `master`, I get these errors:
```
ERROR: Index p_idx = -1 is out of bounds (edited_scene.size() = 1).
   at: get_scene_path (editor/scu/../editor_data.cpp:880)
ERROR: Index p_idx = -1 is out of bounds (edited_scene.size() = 1).
   at: check_and_update_scene (editor/scu/../editor_data.cpp:683)
ERROR: Index p_idx = -1 is out of bounds (edited_scene.size() = 1).
   at: set_edited_scene (editor/scu/../editor_data.cpp:745)
```

Possibly related to recent changes to restore past sessions, but there's nothing to restore in this case?

### Steps to reproduce

- Create a new project, edit it
- Quit to project manager
- Re-open the newly created project -> errors

### Minimal reproduction project

Empty project.
recent_scenes->reset_size();
			
			if (EditorDebuggerNode::get_singleton()->is_visible()) {
				bottom_panel->add_theme_style_override("panel", gui_base->get_theme_stylebox(SNAME("BottomPanelDebuggerOverride"), SNAME("EditorStyles")));
			}
			
			for (int i = 0; i < singleton->main_editor_buttons.size(); i++) {
				Button *tb = singleton->main_editor_buttons[i];
				EditorPlugin *p_editor = singleton->editor_table[i];
				Ref<Texture2D> icon = p_editor->get_icon();
				if (icon.is_valid()) {
					tb->set_icon(icon);
				} else if (singleton->gui_base->has_theme_icon(p_editor->get_name(), SNAME("EditorIcons"))) {
					tb->set_icon(singleton->gui_base->get_theme_icon(p_editor->get_name(), SNAME("EditorIcons")));
				}
			}
			_build_icon_type_cache();
			prev_scene->set_icon(gui_base->get_theme_icon(SNAME("PrevScene"), SNAME("EditorIcons")));
			distraction_free->set_icon(gui_base->get_theme_icon(SNAME("DistractionFree"), SNAME("EditorIcons")));
			scene_tab_add->set_icon(gui_base->get_theme_icon(SNAME("Add"), SNAME("EditorIcons")));
			bottom_panel_raise->set_icon(gui_base->get_theme_icon(SNAME("ExpandBottomDock"), SNAME("EditorIcons")));
			if (gui_base->is_layout_rtl()) {
				dock_tab_move_left->set_icon(theme->get_icon(SNAME("Forward"), SNAME("EditorIcons")));
				dock_tab_move_right->set_icon(theme->get_icon(SNAME("Back"), SNAME("EditorIcons")));
			} else {
				dock_tab_move_left->set_icon(theme->get_icon(SNAME("Back"), SNAME("EditorIcons")));
				dock_tab_move_right->set_icon(theme->get_icon(SNAME("Forward"), SNAME("EditorIcons")));
			}
			help_menu->set_item_icon(help_menu->get_item_index(HELP_SEARCH), gui_base->get_theme_icon(SNAME("HelpSearch"), SNAME("EditorIcons")));
			help_menu->set_item_icon(help_menu->get_item_index(HELP_DOCS), gui_base->get_theme_icon(SNAME("ExternalLink"), SNAME("EditorIcons")));