If you call close() on a Loader and it fails for any reason, it will throw a
runtime error that you can do nothing about. To avoid this, you should wrap it
in a try catch.
The code block comes straight from Flex and it works. If you test it a bunch and
close() never fires an error, then you can remove it. It's really not that much
overhead to keep it in unless you're doing hundreds of iterations per second.
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