Need to get mint info before we can do other operations

[thesimplekid]

We should clean up the api so that this is more clear and the error does not happen at the database level and it is clear that the mint info needs to be fetched.

cdk/crates/cdk/src/wallet/keysets.rs

Lines 92 to 93 in 2827cc4

	// Important
	let _ = self.get_mint_info().await?;