fix: return nil instead of error directly (#6298) #6208

Job	Run time
Dry Run Goreleaser	7m 21s
Test Getting started	4m 41s
flyteadmin integration tests image / build_docker	3m 4s
Check Go Generate (datacatalog) / Go Generate	1m 29s
Check Go Generate (flyteadmin) / Go Generate	2m 23s
Check Go Generate (flytecopilot) / Go Generate	1m 37s
Check Go Generate (flytectl) / Go Generate	2m 8s
Check Go Generate (flytepropeller) / Go Generate	2m 15s
Lint (datacatalog) / Run Lint	2m 40s
Lint (flyteadmin) / Run Lint	3m 34s
Lint (flytecopilot) / Run Lint	1m 58s
Lint (flytectl) / Run Lint	2m 49s
Lint (flyteidl) / Run Lint	2m 4s
Lint (flyteplugins) / Run Lint	3m 12s
Lint (flytepropeller) / Run Lint	3m 13s
Lint (flytestdlib) / Run Lint	2m 45s
Unit Tests (datacatalog) / Run Unit Test	3m 0s
Unit Tests (flytecopilot) / Run Unit Test	2m 43s
Unit Tests (flyteadmin) / Run Unit Test	4m 50s
Unit Tests (flytepropeller) / Run Unit Test	4m 12s
Unit Tests (flyteplugins) / Run Unit Test	3m 52s
Unit Tests (flytectl) / Run Unit Test	3m 34s
Unit Tests (flytestdlib) / Run Unit Test	3m 48s
Build Images / Build & Push Image (datacatalog) / Push to Github Registry	4m 56s
Build Images / Build & Push Image (flyteadmin) / Push to Github Registry	7m 36s
Build Images / Build & Push Image (flytecopilot) / Push to Github Registry	5m 11s
Build Images / Build & Push Image (flytepropeller) / Push to Github Registry	7m 36s
Build Images / Build & Push Image (flytescheduler) / Push to Github Registry	8m 5s
Integration Test (flyteadmin) / Integration tests	5m 51s
	1h 52m 27s

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