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Add null override category to selector

Question asked by jbryant_wya on Apr 18, 2019
Latest reply on Aug 10, 2020 by whughesD3

I'm trying to add a Category Selector to my dashboard that selects by "Receiver" from the GNSS metadata field populated from the Collector App. Looking at my data, the high accuracy receivers and the iOS devices populated the field, but if the editor was using an Android device (and the new Collector Beta for Android), the receiver field is blank (null).

I have successfully loaded all of the categories that have defined values, but I would like to add the null value records and label the category as "Android".

When using the "+ Override" button, what string do I need to enter to select the blank or null values? I've used "", null, {}, {null} and " " with no luck.