e.map is not a function

[smnsht]

What this PR does / why we need it: Fixes "e.map is not a function" JS exception in the UI

Which issue(s) this PR fixes:
"e.map is not a function" JS exception in the UI #1839

Please reference the issue this PR will close: #[issue number]

1839

Special notes for your reviewer: The new sample project is not part of the PR, it just reproduces the error. Once the maintainer approves this change, I will add unit tests.

Does this PR introduce a user-facing change?: No

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• [*] Code compiles correctly
• [ ] Created/updated tests
• [ ] Unit tests passing
• [ ] End-to-end tests passing
• [ ] Extended the documentation
• [ ] Provided sample for the feature