TableView reloadData issue

[tosty33]

Hello,

I think that there should be a check if the first element even exists in the tableView: https://github.com/coronalabs/framework-widget/blob/9c1aed5838704a5b0184130c2bf4691f7c163f56/widgetLibrary/widget_tableview.lua#L1687

Right now CoronaSDK throws an error when trying to reload empty table view.