tableView:commitEditingStyle:forRowAtIndexPath is called with indexPath == nil when deleting.

Originator:herlihalim
Number:rdar://16386709 Date Originated:
Status:Open Resolved:
Product:iOS SDK Product Version:7.0
Classification: Reproducible:Always
 
Summary:
The delegate method is called, even though when it shouldn't when tapping delete button multiple times, with indexPath == nil.

Steps to Reproduce:
1. Setup a basic project with UITableViewController.
2. Add a few items.
3. Trigger editing mode / just swipe to delete the last row.
4. When the delete button appears, tap it multiple times. (Keep tapping even though the button is no longer there).
5. tableView:commitEditingStyle:forRowAtIndexPath: is called with the value of indexPath == nil.

The delegate method is only called this way if the current row is the last row.

Expected Results:
tableView:commitEditingStyle:forRowAtIndexPath: not being called at all. Delete button is no longer visible, user shouldn't be able to interact with it.

Actual Results:
Delete button is still interactive even though it's not longer visible.

Version:
iOS 7 above.

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