Explore to include only stocks under GICS classification

I am using Norgate US database. There are stocks appear on my result, which don't have GICS classification data. I need to exclude those stocks to not appear on my results. How to add an AFL line similar below or on the explorer settings.

gics_true = ***;
Filter = gics_true AND ***;

gics_true = GicsID(0) != "";

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