Fix makeRelease issue that causes afterRelease hook to run in the dry run mode

[bugron]

What Changed

makeRelease hook now returns undefined instead of an empty array in dry run mode for independent lerna versioing to prevent afterRelease hook from running.

Closes #2516

Why

To fix the dry run mode for monorepos with "version": "independent" configuration.

Todo:

• Add tests
• Add docs

Change Type

Indicate the type of change your pull request is:

• documentation
• patch
• minor
• major

[bugron]

Hey @hipstersmoothie ✋, explicitly tagging you since I cannot add you as a PR reviewer. Thanks.