Sam e5bb4bbd59
FIX: banners not removing when unset (#22678)
Initializing an EmberObject with a null object leads to an exception. This commit stops that from happening, and introduces an acceptance test for adding/removing banner topics via message-bus.

Co-authored-by: David Taylor <david@taylorhq.com>
2023-07-19 11:57:52 +01:00
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