Return if executors length is zero in ParallelExecutor

act/common/executor.go

@@ -98,6 +98,10 @@ func NewErrorExecutor(err error) Executor {
 // NewParallelExecutor creates a new executor from a parallel of other executors
 func NewParallelExecutor(parallel int, executors ...Executor) Executor {
 	return func(ctx context.Context) error {
+		if len(executors) == 0 {
+			return nil
+		}
+
 		work := make(chan Executor, len(executors))
 		errs := make(chan error, len(executors))