Handle empty component and service names

[nscuro]

Description

Handles empty component and service names.

component.name and service.name are required as per CycloneDX specification, but the schema doesn't sufficiently enforce this requirement (CycloneDX/specification#461).

Because DT trims names from the BOM during model conversion, empty or blank names end up becoming null. Since the respective database columns have a NOT NULL constraint on them, inserting or updating such components will always fail.

Usually we would not want to try to "repair" data, but the name being empty appears to be so common that there's no other sensible way for us to deal with it.

With this change, empty names will end up being saved as - instead, to signal the absence of a proper value.

Addressed Issue

Fixes #2821

Additional Details

N/A

Checklist

• I have read and understand the contributing guidelines
• This PR fixes a defect, and I have provided tests to verify that the fix is effective
• This PR implements an enhancement, and I have provided tests to verify that it works as intended
• This PR introduces changes to the database model, and I have added corresponding update logic
• This PR introduces new or alters existing behavior, and I have updated the documentation accordingly

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ 100.00% (target: 70.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (a15803f)	21934	17253	78.66%
Head commit (146b9e1)	21934 (+0)	17253 (+0)	78.66% (+0.00%)

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Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#4146)	2	2	100.00%

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