Just throwing this out there: I just realized that it’s rather easy to plop a reusable element onto one’s page and forget to fill out the “Data Source” field. This can cause one quite a bit of confusion when that happens.
Now, I don’t think we’d want the Issue Checker to throw an error about that (there being cases where you wouldn’t yet want to set a source), but I also realized that the App Search Tool does not let you locate instances of reusables in your project that DO NOT (or alternately DO) have Data Source’s defined.
This would be handy as I suspect I have a page or two where I’ve forgotten to set a certain reusable’s data source properly and it’s rather a pain to find them…