Probably fix intermittent irreproducible NPE

[sleekweasel]

We're seeing this NPE in all OS versions from 2.3 to 4.3 (the vast majority in 2.3.6), ultimately ending up in View.dispatchRestoreInstanceState. 'container' seems to be the only object invoked with a method in the versions of dispatchRestoreInstanceState() I've examined.

Caused by: java.lang.NullPointerException 1 android.view.View.dispatchRestoreInstanceState View.java, line 6473 2 android.view.ViewGroup.dispatchRestoreInstanceState ViewGroup.java, line 1211 3 android.view.View.restoreHierarchyState View.java, line 6457 4 com.actionbarsherlock.internal.view.menu.MenuBuilder.restoreActionViewStates SourceFile, line 361 5 com.actionbarsherlock.internal.ActionBarSherlockCompat.preparePanel SourceFile, line 503 6 com.actionbarsherlock.internal.ActionBarSherlockCompat.dispatchInvalidateOptionsMenu SourceFile, line 272 7 com.actionbarsherlock.app.SherlockFragmentActivity.invalidateOptionsMenu SourceFile, line 150 8 com.actionbarsherlock.app.SherlockFragmentActivity.supportInvalidateOptionsMenu SourceFile, line 156