Yes it's empty, no one will refill it without fixing the damage first, they should use a inert gas to check for any potential leaks first, but some cheat and use a vacuum to check but this often helps to seal things like joins etc that are leaking, so not good, don't even think it's legal now.
You need a new condenser, and receiver dryer, then refill, make sure they put in the proper PAG(poly alpha glycolene) oil as well as tracer dye, easier to find leaks that may crop up in future, make sure you use the AC at least 30 mins per month even in winter.
tabetha