Text overlay,Text is zero not display.

Thanks for reporting and working on this. If $params['text'] will be a zero (a number), this code will behave differently on older PHP versions (the result will be TRUE) and newer PHP versions (the result will be FALSE):

if ($params['text'] == "") {
  ...
}

Also if it is possible, that $params['text'] can be NULL, then the patch will change the current behavior.