Alloy: Conditionally Display ImageView

I have an imageview defined in a view as such:

<View id="body">
            <Label id="questiontxt" text="Question:  {$.questionObj.questiontext}"/>
            <ImageView id="questionimg" image="{$.questionObj.questionimage}"></ImageView>
            <Button id="addScore" onClick="incScore">Add to score</Button>
        </View>

However sometimes questionimage is blank and in those cases I dont want to show the view at all. What is the most appropriate way to handle this situation? Do I just hide the image view in the controller using the visible attribute? Is there some other way to method that is more appropriate?