ZIPReader cannot open empty zip file

[DukeVengeance]

Godot version

4.0.rc1

System information

Windows 10

Issue description

ZIPReader cannot open empty zip files.
When trying to open an empty zip file, a very generic error FAILED (1) is returned, if opening an empty zip file should fail, the returned error code should at least be more specific.
The issue is probably related to no file index in an empty zip file.

Steps to reproduce

For convenience, empty.zip and not_empty.zip are created in user:// , with an empty text file in not_empty.zip

func _ready() -> void:
	var zip := ZIPReader.new();
	var error := zip.open("user://empty.zip");
	print(error_string(error)); # -> FAILED
	var error2 := zip.open("user://not_empty.zip");
	print(error_string(error2)); # -> OK

Minimal reproduction project

N/A