Avoid crash when oneOf input variable is not defined #3078

Job	Run time
Security check of added dependencies	4s
Diff content of NPM package	45s
ci / Check for commonly ignored files	6s
ci / Lint source files	45s
ci / Run fuzzing tests	24s
ci / Measure test coverage	27s
ci / Run tests on Node v16	20s
ci / Run tests on Node v12	21s
ci / Run tests on Node v14	19s
ci / Run CodeQL security scan	1m 23s
ci / Run integration tests	1m 6s
ci / Run tests on Node v17	22s
ci / Check health of package-lock.json file	21s
ci / Build 'npmDist' artifact	0s
ci / Build 'denoDist' artifact	0s
	6m 43s

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