how check for an empty variable?

[Coyote @ rage]

I have a dialog where the player is supposed to enter text into an RscEdit.
How can I check, if the the user did not enter anything?
If he doesnÂ't, it doesnÂ't return an empty string, it returns nothing, so
? _enteredText == " "     does no work.

[Coyote @ rage]

DonÂ't bother, found a workaround:

In Description.ext, itÂ's possible to set a default text:

class RscEdit
{
       type = CT_EDIT;
       idc = -1;
       style = ST_LEFT;
       font = FontHTML;
       sizeEx = 0.02;
       colorText[] = {0, 0, 0, 1};
       colorSelection[] = {0.5, 0.5, 0.5, 1};
       autocomplete = false;
       text = "Default Text";
};

[Dinger]

Well, actually, any boolean with an undefined variable value will return "FAlse", so:
?myvar == myvar:goto "IsDefined"
#not defined