(fix) Make extraction of the calculated value null safe

[pirupius]

Requirements

• This PR has a title that briefly describes the work done including the ticket number. If there is a ticket, make sure your PR title includes a conventional commit label. See existing PR titles for inspiration.
• My work conforms to the OpenMRS 3.0 Styleguide and design documentation.
• My work includes tests or is validated by existing tests.

Summary

Makes extraction of calculated value null safe in scenarios where return value differs

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Related Issue

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[samuelmale]

LGTM!

[github-actions]

Size Change: +113 B (+0.01%)

Total Size: 1.25 MB

ℹ️ View Unchanged

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dist/main.js	354 kB	+95 B (+0.03%)
dist/openmrs-esm-form-engine-lib.js	3.8 kB	0 B

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