Crash when dragging off end of table

[GeorgeSealy]

To reproduce:

• implement tableView: targetIndexPathForMoveFromRowAtIndexPath: toProposedIndexPath: in table view delegate
• try to drag off the bottom of the table
• crash

The crash is in HPReorderTableView.m, - (void)updateCurrentLocation:(UILongPressGestureRecognizer *)gesture. toIndexPath is nil which results in a crash. A possible fix is:

if ([self.delegate respondsToSelector:@selector(tableView:targetIndexPathForMoveFromRowAtIndexPath:toProposedIndexPath:)])
{
    if (toIndexPath == nil) {
        return;
    }
        
    toIndexPath = [self.delegate tableView:self targetIndexPathForMoveFromRowAtIndexPath:_reorderInitialIndexPath toProposedIndexPath:toIndexPath];
}