Trying to open a project crashes godot if gui/theme/default_theme_scale project setting is set to NAN.

[ghost]

Godot version

v4.2.dev3.official.013e8e3af

System information

Windows 10.0.19045 - GLES3 (Compatibility)

Issue description

Setting gui/theme/default_theme_scale project setting to NAN (by typing NAN into the field in the Godot editor) makes a project crash and spam the console with the following errors when it is ran:

USER ERROR: ImageLoaderSVG: Couldn't set target on ThorVG canvas.
   at: create_image_from_utf8_buffer (modules/svg/image_loader_svg.cpp:113)
USER ERROR: Failed generating icon, unsupported or invalid SVG data in default theme.
   at: generate_icon (scene/resources/default_theme/default_theme.cpp:92)

Additionally, closing the editor without changing the setting back makes the project virtually non-openable, by crashing the editor every time it tries to open the project.

Steps to reproduce

0. Create a new project.
1. Set gui/theme/default_theme_scale project setting to NAN (by typing NAN in).
2. Try to run the project.
3. Close the editor.
4. Try to open the project again.

Minimal reproduction project

Warning: non-openable because of the crash.
default_theme_scale_nan_test.zip

[AThousandShips]

Can this still be replicated after #81076?

[akien-mga]

Fixed by #81076.

It can likely be reproduced from code by setting nan manually to that project setting, but I'm not sure we want to go that far into preventing users from shooting themselves in the foot :)