### Tested versions

Caused by [0d6300d269b818e6c3d3ea9cbc592480103aa6d0] Fix folder color not showing up in file dialogs
https://github.com/godotengine/godot/pull/84837
(git bisection)

### System information

Godot v4.3.dev (6faa5c6dc) - Fedora Linux 39 (Workstation Edition) - Wayland - Vulkan (Forward+) - dedicated AMD Radeon RX Vega (RADV VEGA10) () - AMD Ryzen 7 5800X 8-Core Processor (16 Threads)

### Issue description

When opening the export path, it results in a black popup.

![image](https://github.com/godotengine/godot/assets/270928/d67dee6a-f1e1-4bf3-8a3f-419554269f4a)


### Steps to reproduce

1. Open export settings
2. Add an export target
3. Try to select an export path

### Minimal reproduction project (MRP)

n/a
int idx = filter->get_selected();
			if (filters.size() > 1) {
				idx--;
			}
			if (idx >= 0 && idx < filters.size()) {
				String flt = filters[idx].get_slice(";", 0);
				int filterSliceCount = flt.get_slice_count(",");
				for (int j = 0; j < filterSliceCount; j++) {
					String str = (flt.get_slice(",", j).strip_edges());
					if (f.match(str)) {
						valid = true;
						break;
					}
				}
				if (!valid && filterSliceCount > 0) {
					String str = (flt.get_slice(",", 0).strip_edges());
					f += str.substr(1, str.length() - 1);
					_request_single_thumbnail(get_current_dir().path_join(f.get_file()));
					file->set_text(f.get_file());
					valid = true;
				}
			} else {
				valid = true;
			}
		}
		
		String file_name = file_text.strip_edges().get_file();
		if (file_name.is_empty()) {
			error_dialog->set_text(TTR("Cannot save file with an empty filename."));
			error_dialog->popup_centered(Size2(250, 80) * EDSCALE);