A way to distinguish errors from not supported

[fschulze]

I'd like to adjust the API, so we can distinguish request errors from not supported URLs.

Either a function which checks if there is a plugin that supports the link, or an option on Embedder creation which raises any thrown errors instead of swallowing them. What would you prefer?

[mrtopf]

I think I would prefer the exception as it's something which needs fixing then eventually (even if it's not catched and e.g. does a 500. In case it's logged you have some action item then).

(and one can always add a function later which checks for the availability of a plugin).