Merge pull request 'Clear persister from handler in outer code aswell' (#200) from lash/persister-freakout into master

Reviewed-on: urdt/ussd#200

internal/handlers/base.go

@@ -55,6 +55,9 @@ func(f *BaseSessionHandler) Process(rqs RequestSession) (RequestSession, error)
 	}
 
 	f.hn = f.hn.WithPersister(rqs.Storage.Persister)
+	defer func() {
+		f.hn.Exit()
+	}()
 	eni := f.GetEngine(rqs.Config, f.rs, rqs.Storage.Persister)
 	en, ok := eni.(*engine.DefaultEngine)
 	if !ok {

internal/handlers/ussd/menuhandler.go

@@ -113,7 +113,7 @@ func (h *Handlers) Init(ctx context.Context, sym string, input []byte) (resource
 		return r, nil
 	}
 	defer func() {
-		h.pe = nil
+		h.Exit()
 	}()
 
 	h.st = h.pe.GetState()
@@ -140,6 +140,10 @@ func (h *Handlers) Init(ctx context.Context, sym string, input []byte) (resource
 	return r, nil
 }
 
+func (h *Handlers) Exit() {
+	h.pe = nil
+}
+
 // SetLanguage sets the language across the menu
 func (h *Handlers) SetLanguage(ctx context.Context, sym string, input []byte) (resource.Result, error) {
 	var res resource.Result