Prevent crash after deleting sprite that had been highlighted #3745
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@ericrosenbaum fixes the crashing problem you found. The problem was that the highlight component gets rerendered when you switch stage mode, but the highlightedTargetId may not still be available.
The real change here is just checking that the target still exists.
Adds an integration test also, using the simplest repo I could find:
/cc @BryceLTaylor I think we may want to hotfix this to master