[bugfix] Fix error extracting status content: no content found
#598
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This PR closes #565 by updating ExtractContent to just return an empty string if no Content is found in an Activity, since this isn't technically an error, it just means that no text content was set and most likely the post contains a poll or media or something. It also updates the extract content function to check if there's an IRI in the content field, because that's a thing that can sometimes happen.