Preference is causing crash when table is empty

[sonique6784]

Hi!

savePreferences() is causing crash when empty, cause not child can be found.

java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getLeft()' on a null object reference at com.evrencoskun.tableview.handler.ScrollHandler.getColumnPositionOffset(ScrollHandler.java:112) at com.evrencoskun.tableview.handler.PreferencesHandler.savePreferences(PreferencesHandler.java:43) at com.evrencoskun.tableview.TableView.onSaveInstanceState(TableView.java:730)

[evrencoskun]

Hi @sonique6784

Thanks for the bug report.