Client: clean up

src/client.rs

@@ -382,13 +382,7 @@ pub struct State {
 impl ProgramState for State {
     fn is_valid_cashier_public_key(&self, public: &jubjub::SubgroupPoint) -> bool {
         debug!(target: "CLIENT STATE", "Check if it is valid cashier public key");
-
-        if self.public_keys.is_empty() {
-            error!(target: "State", "No cashier public key");
-            return false;
-        } else {
-            return self.public_keys.contains(public);
-        }
+        return self.public_keys.contains(public);
     }
 
     fn is_valid_merkle(&self, merkle_root: &MerkleNode) -> bool {