fix: add serde default on mint description

crates/cdk/src/fees.rs

@@ -26,11 +26,8 @@ pub fn calculate_fee(
         let proofs_fee = keyset_fee_ppk * proof_count;
 
         sum_fee += proofs_fee;
-        println!("{}", sum_fee);
     }
 
-    println!("{}", sum_fee);
-
     let fee = (sum_fee + 999) / 1000;
 
     Ok(fee.into())

crates/cdk/src/nuts/nut04.rs

@@ -215,6 +215,7 @@ pub struct MintMethodSettings {
     #[serde(skip_serializing_if = "Option::is_none")]
     pub max_amount: Option<Amount>,
     /// Quote Description
+    #[serde(default)]
     pub description: bool,
 }