Validate selection fractions

[FlorianPfaff]

Small input-validation fix for selection helper fractions.

Testing: not run locally.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	64.25s
✅ JSON	prettier	7	0	0	0	1.12s
✅ JSON	v8r	7		0	0	4.31s
✅ MARKDOWN	markdownlint	68	0	0	0	1.99s
✅ MARKDOWN	markdown-table-formatter	68	0	0	0	0.79s
✅ PYTHON	black	890	10	0	0	59.64s
✅ PYTHON	isort	890	11	0	0	3.44s
✅ REPOSITORY	checkov	yes		no	no	48.72s
✅ REPOSITORY	gitleaks	yes		no	no	7.67s
✅ REPOSITORY	git_diff	yes		no	no	0.09s
✅ REPOSITORY	secretlint	yes		no	no	24.78s
✅ REPOSITORY	syft	yes		no	no	2.36s
✅ REPOSITORY	trivy-sbom	yes		no	no	7.74s
✅ REPOSITORY	trufflehog	yes		no	no	26.59s
✅ YAML	prettier	11	0	0	0	0.83s
✅ YAML	v8r	11		0	0	11.56s
✅ YAML	yamllint	11		0	0	0.62s

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