assertDisplayed doesn't redirect the error to the current FailureHandler

The catch in assetDisplayed is not right. When a view is not displayed (first case in the code), the error is absorbed by the SpyFailureHandler and never redirected to the default one.
This breaks the FailureHandler behaviour for things like taking screenshots on failure.

Locate assertDisplayed and inspect the catch around the first not-displayed case and SpyFailureHandler. Reproduce the failure in the instrumentation-test path, then verify that the error reaches the current or default FailureHandler so failure screenshots still work.

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