The beer will likely be flat. The keg is at atmospheric pressure if you open the faucet and nothing comes out. Most kegs need to be at 10-14 PSIG to keep if you didn't know. Also there is now air in your keg.
You need to keep an eye on the tank gauge, when it hits zero keep a very close eye on the line gauge. As soon as it starts going down untap the keg.
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