chore: sync upstream PR #7535 - Update WebColor.java to don't crash on empty string on colorString var

[riderx]

Upstream PR Sync

This PR syncs changes from an external contributor's PR on the official Capacitor repository.

Original PR

• PR: #7535
• Title: Update WebColor.java to don't crash on empty string on colorString var
• Author: @aleixfargas

Automation

• CI will run automatically
• Claude Code will review for security/breaking changes
• If approved, this PR will be auto-merged

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Synced from upstream by Capacitor+ Bot

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📥 Commits

Reviewing files that changed from the base of the PR and between 270d700 and c5a6390.

📒 Files selected for processing (1)

• android/capacitor/src/main/java/com/getcapacitor/util/WebColor.java (1 hunks)

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch sync/upstream-pr-7535

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