v0.7.1: Fix false warning about enum labels

[LelsersLasers]

No description provided.

[Copilot]

Pull request overview

Fixes a spurious warning emitted when decoding signals that have metadata but no enum label map, and bumps the crate/documentation version to 0.7.1.

Changes:

• Only emit the “missing enum label” warning when an enum map is actually present (non-empty).
• Bump crate version from 0.7.0 to 0.7.1.
• Update README and lockfile to reflect the new version.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
src/lib.rs	Prevents false “missing enum label” warnings by gating the warning on a non-empty enum map.
README.md	Updates the suggested dependency version to 0.7.1.
Cargo.toml	Bumps package version to 0.7.1.
Cargo.lock	Updates the locked package version entry for can_decode to 0.7.1.

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