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Yeah... That ain't right!
If it's empty and you're still getting nothing out, something is really wrong.
Is it a brand new machine? Did you take all of the basket apart and clean it all thoroughly?With the pressurised basket it's easy for the small hole in the metallic part to get blocked with old coffee. If it's a second hand machine, give it a good descale. If it's brand new, probably send it back?
Not sure about your leak, I think that's likely just water finding it's way out once the basket is pressurised and path of least resistance since the basket is blocked.
Still having w0ahs with my Dedica
Heres a video of trying to push a double shot out through an empty filter
https://streamable.com/rp5v2y
I think it shows water leaking from between the group head and the portafilter at the start of the shot. Any ideas whats wrong?