Bug fix #3898 "Page Not Refreshed"

A GET parameter ajax_page_request was passed with value as true
This parameter was required to reload the tbl_structure page which called the function to display Table stats.

Since it was send as Ajax request, So all the page display was done by Ajax and hence normal response->addHTML wouldn't work.
so i added another response->addJSON() and later on used it if ajax was successful. 

Please point out if i have done some mistake

Thank you