I have two tables (course and description) that are cross-filtered. If I click on a course title, the course description appears in the description table. However, in the default state, the description table shows all the course descriptions; I want it empty until a course title is selected. I've tried adding a filter to the description table (include:title:is null), which does make the description table show "No data," but nothing appears when I click on a course title. I'm sure that there is a simple solution here. Thanks in advance.
Mark
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