fix: changelog generation breaks if no annotations are defined

[chgl]

closes #342

[github-actions]

🦙 MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	5		0	0.14s
✅ BASH	bash-exec	4		0	0.05s
✅ BASH	shellcheck	4		0	0.14s
✅ BASH	shfmt	4		0	0.04s
✅ DOCKERFILE	hadolint	1		0	1.42s
✅ EDITORCONFIG	editorconfig-checker	48		0	1.63s
✅ JSON	eslint-plugin-jsonc	4		0	1.66s
✅ JSON	jsonlint	4		0	0.31s
✅ JSON	npm-package-json-lint	yes		no	0.56s
✅ JSON	prettier	4		0	0.53s
✅ JSON	v8r	4		0	5.5s
⚠️ MARKDOWN	markdownlint	5		9	0.65s
✅ REPOSITORY	checkov	yes		no	15.51s
✅ REPOSITORY	devskim	yes		no	1.96s
✅ REPOSITORY	gitleaks	yes		no	0.42s
✅ REPOSITORY	git_diff	yes		no	0.01s
✅ REPOSITORY	grype	yes		no	13.28s
✅ REPOSITORY	kics	yes		no	47.76s
✅ REPOSITORY	secretlint	yes		no	0.77s
✅ REPOSITORY	syft	yes		no	0.48s
✅ REPOSITORY	trivy	yes		no	13.88s
✅ REPOSITORY	trivy-sbom	yes		no	1.28s
✅ REPOSITORY	trufflehog	yes		no	13.79s

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[chgl]

🎉 This PR is included in version 2.2.2 🎉

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