Avoid invoking the script with an empty batch

limitador/src/storage/redis/redis_cached.rs

@@ -293,7 +293,11 @@ async fn update_counters<C: ConnectionLike>(
  let redis_script = redis::Script::new(BATCH_UPDATE_COUNTERS);
  let mut script_invocation = redis_script.prepare_invoke();
 
- let mut res: Vec<(Counter, i64, i64)> = Vec::new();
+ let mut res: Vec<(Counter, i64, i64)> = Vec::with_capacity(counters_and_deltas.len());
+ if counters_and_deltas.is_empty() {
+ return Ok(res);
+ }
+
  for (counter, delta) in counters_and_deltas {
  let delta = delta.pending_writes().expect("State machine is wrong!");
  if delta > 0 {