add a test repro for a "View not found" error #3039
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Hello! This is a repro for a bug that I have been experiencing working on some other stuff in Perspective.
Perspective regularly conflates and squashes messages that are out of date, and it does this by using the exception mechanism (With a message "View not found") to signal such an event has occurred. However, this repro shows a place where this message is presented to the user instead of being swallowed by the engine. A proper fix will end up hiding this message as is expected.