Filter NULL values within Analyzer
I'm trying to built a basic table card that only shows records where the Brand attribute is NULL. I know for a fact that there are records that meet this criteria in my data set, as shown in the image below.
https://us.v-cdn.net/6032830/uploads/5ACY9EQ72GBM/image.png
What's puzzling is that when I apply the filter, it doesn't return any records.
https://us.v-cdn.net/6032830/uploads/VI98NPDQSIG9/image.png
The filter works as it should for every other Brand, just not a blank field. What am I doing wrong?