add support for operators

src/grpc.rs

@@ -239,7 +239,7 @@ impl BrainCli for BrainCliMock {
             req.wallet, req.as_operator
         );
         let mut contracts = Vec::new();
-        if req.uuid.is_empty() {
+        if !req.uuid.is_empty() {
             if let Ok(specific_contract) = self.data.find_contract_by_uuid(&req.uuid) {
                 if specific_contract.admin_pubkey == req.wallet {
                     contracts.push(specific_contract);