I'm having some issues with locating the highlighting array. I have built a visual with two Grouping DataRoles and one Measure Data Role (the measure roll may or may not be filled). I can observe the highlights array when the Measure DataRole is filled with data, however, when it is empty (the visual will still build when empty) there is no way to access the highlight array that resides in the categorical.values location as it is null at this level. I've tried to create a dummy class inside the powerbi.extensibility.visual module to use a filter to get a filtered value that can be accessed from the main visual building class, but predictably, I just ended up filtering all the data coming. Is there any way to get around this?