Fixed RSoD error with moduleproperty filter operator

[flibbles]

Found this while working with this filter operator. If you try to pull properties from tiddlers that aren't actually modules, then you get a crash.

Hope this operator wasn't an afterthought. This seemed like a pretty obvious bug, and there weren't any tests for it at all.

Let me know if this isn't the preferred fix.

[github-actions]

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[flibbles]

I have added another commit to this so that there is no longer a RSoD when you fetch a non-string property either.

Instead, the operator will JSON.stringify the property and return it. I would like to see this behavior, because it would be super useful for me to query my graph visualization engines for what features they can do. All part of my upcoming super-cool graph plugin designed to replace TiddlyMap.

[Jermolene]

Thanks for your patience @flibbles, looks good.