Updated currentValue to be optional in getGradientObject

[CmCarti]

The function is checking for a falsey value before doing anything with it, so I assume this was always the intent. Easy enough to fix at least.

[zdila]

👋 Heads-up: I've published a maintained fork that bundles this PR together with #128, #130 and #132, since they're still open upstream.

• 📦 npm: @zdila/react-gradient-color-picker
• 🔗 source: https://github.com/zdila/react-gradient-color-picker

Thanks @CmCarti — your optional currentValue change in getGradientObject is included as-is.

This is an unofficial community fork, not affiliated with the upstream maintainer — published simply to help anyone who needs these changes now. Happy to upstream any of it if a maintainer would like.

(Fork prepared with Claude Code.)