calling getData(true) returns an empty string

[Han Hsu]

As titled, in version 4.4.6 if you try to call getData(true) you will get a empty string instead of current value. use case: ​http://jsfiddle.net/svapyzjz/1/

Reproduce Step:

1. type something in the editor (ex: 'abc')
2. click on the get button
3. you can see that it alerts an empty string.

[Jakub Ś]

DUP of #9977.

This method works this way by design by design. I will however update documentation so that parameter is explained in more detail.