fix(participant): SKFP-816 vital status display

[AltefrohneGaelle]

[BUG] Display vital status or a dash

Description

SKFP-816
Remove null value from vital status list.

Validation

• Code Approved
• Test Coverage
• QA Done
• Design/UI Approved from design

Screenshot

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[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟢	Statements	100%	0/0
🟢	Branches	100%	0/0
🟢	Functions	100%	0/0
🟢	Lines	100%	0/0

Test suite run success

0 tests passing in 0 suite.

Report generated by 🧪jest coverage report action from c98d562