App crashes when applying linked curves and non-existent values

[IHIutch]

Describe the bug
App crashes when applying linked curves and invalid values

To Reproduce
Steps to reproduce the behavior:

1. Create a curve
2. Apply it to your color
3. Adjust curve via input spinner to push curve toward a non-existant value (out of bounds)

Expected behavior
The app doesn't crash, causing me not to reach my color palette anymore. I shouldn't be able to use the spinner to create a non-existant color

Screenshots (Video)
https://user-images.githubusercontent.com/20825047/192326341-56e3fa9b-a3f4-4d92-8de3-706a3e43708c.mp4

Additional context
It seems like there might be a few things at work. App crashes when an invalid hex value is created but it also seems like the linked curves are messing with the input values.

It would also be nice if I could reach my palettes again. If I attempt to open the color palette that caused the app to crash, it crashes again