Check if textBox is empty

I’m struggling with a piece of code where I check if a textBox is empty. Here is the code:

script myAppDelegate
	property parent : class "NSObject"
	property aValue : missing value
on button_submitClick_(sender)
		set myValue to aValue's stringValue()
			if myValue is equal to ""  then
				display dialog "Required information is missing" with title "myApp"

				display dialog  " Note:" & myValue 
			end if

	end button_submitClick_
end script

The code always goes into the ‘else’ block. Why is the string comparison failing? Is there a method I can use to check if user provided a value in the ‘aValue’ textbox?


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