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ArcGIS Online Filter Widget -empty- value

Question asked by ADES_LMurray on Jul 13, 2018
Latest reply on Dec 31, 2018 by a00847138

Not sure when this started or why but when I build a filter widget in the ArcGIS Online Web AppBuilder and set the expression to accept unique values, in the list of available values is one called "-empty-."  When I select this value in the filter, it apparently has the same effect as turning off the filter in that all features are shown on the map.  Is there a way to remove the -empty- option from the value list?  I want to force users to select a specific value in the filter and not have the ability to see all features on the map.


Example of -empty- option in filter drop-down list.