Small improvement

app/src/main/java/eu/faircode/email/ActivityView.java

@@ -2219,6 +2219,7 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
 
             @Override
             protected void onExecuted(Bundle args, Long id) {
+                if (id != null)
                     startActivity(new Intent(ActivityView.this, ActivityCompose.class)
                             .putExtra("action", "edit")
                             .putExtra("id", id));