fix: toml-compatible fingers-crossed handling for failed input data decoding

[jkowalleck]

fixes https://github.com/CycloneDX/cyclonedx-python/actions/runs/6744341663/job/18334009004#step:8:161

follow-up of #612

[codacy-production]

Coverage summary from Codacy

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Coverage variation	Diff coverage
Report missing for 6002e0e1	66.67%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (6002e0e)	Report Missing	Report Missing	Report Missing
Head commit (da796d2)	463	290	62.64%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#613)	3	2	66.67%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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