potlatch2
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Circularise bug 3786
Fix #3786 by preventing user trying to circularise problematic shapes like figure-eights.
Will use this logic but want to check first whether it can be done without try... catch (which is usually a last resort).
Yeah, I considered trying to pass back the error message more directly, but that also seemed messy. I would have liked to create a custom exception class, but that seems to require a new file, which seemed messy in a different way.