Calcs & Events should show an error if the tag name is invalid

Normally if there is a problem in a calc/event we see the error like this:

BUT it doesn't look like tag names are checked. Below for example we have an event property for a tag but that tag doesn't exist (and isn't returned when we look at the tag list) but it doesn't throw an error. Initially we weren't getting the event backfilled and didn't understand why. I think the messages tile in Canary Admin had something in there but we had to know to check that and it still slowed down our investigation and resolution. It would be nice if the error was also shown directly in the calc/event editor like other errors are.