Fix bug on rust client with void responses

templates/Rust/src/lib.rs

@@ -79,7 +79,8 @@ impl JRPCClient {
             } else if let Some(result) = result.result {
                 return Ok(result);
             } else {
-                return Err(format!("No result received").into());
+                return Ok(Value::Null);
+                // return Err(format!("No result received").into());
             }
         } else {
             return Err("Error while receiving result".into());