Otherwise we might dereference it, per this play store gathered trace:
Xiaomi Redmi 3S (land), 2048MB RAM, Android 7.1
java.lang.NullPointerException:
at com.wireguard.android.model.Tunnel.setConfig (Tunnel.java:118)
at com.wireguard.android.fragment.TunnelEditorFragment.onOptionsItemSelected (TunnelEditorFragment.java:160)
at android.app.Fragment.performOptionsItemSelected (Fragment.java:2478)
at android.app.FragmentManagerImpl.dispatchOptionsItemSelected (FragmentManager.java:2182)
at android.app.FragmentController.dispatchOptionsItemSelected (FragmentController.java:336)
at android.app.Activity.onMenuItemSelected (Activity.java:3211)
at com.android.internal.policy.PhoneWindow.onMenuItemSelected (PhoneWindow.java:1219)
at com.android.internal.view.menu.MenuBuilder.dispatchMenuItemSelected (MenuBuilder.java:761)
at com.android.internal.view.menu.MenuItemImpl.invoke (MenuItemImpl.java:152)
at com.android.internal.view.menu.MenuBuilder.performItemAction (MenuBuilder.java:904)
at com.android.internal.view.menu.MenuBuilder.performItemAction (MenuBuilder.java:894)
at android.widget.ActionMenuView.invokeItem (ActionMenuView.java:616)
at com.android.internal.view.menu.ActionMenuItemView.onClick (ActionMenuItemView.java:152)
at android.view.View.performClick (View.java:5637)
at android.view.View$PerformClick.run (View.java:22433)
at android.os.Handler.handleCallback (Handler.java:751)
at android.os.Handler.dispatchMessage (Handler.java:95)
at android.os.Looper.loop (Looper.java:153)
at android.app.ActivityThread.main (ActivityThread.java:6244)
at java.lang.reflect.Method.invoke (Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:891)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:781)
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
