added check for nil shutdown

Signed-off-by: Michelle Fernandez Bieber <mfbieber@gmail.com>
(cherry picked from commit d9301441f4)

pkg/action/hooks.go

@@ -34,6 +34,9 @@ import (
 // execHook executes all of the hooks for the given hook event.
 func (cfg *Configuration) execHook(rl *release.Release, hook release.HookEvent, waitStrategy kube.WaitStrategy, timeout time.Duration, serverSideApply bool) error {
 	shutdown, err := cfg.execHookWithDelayedShutdown(rl, hook, waitStrategy, timeout, serverSideApply)
+	if shutdown == nil {
+		return nil
+	}
 	if err != nil {
 		if err := shutdown(); err != nil {
 			return err