How can I use a series of cascading filters in a dashboard and allow some of them to take a value in the liquid variable hyperlink, while some filters allow null values? The first dashboard a user visits in a series of 4 has 13 separate filters. Once chosen, those filters need to affect the next dashboard my user visits - so they won't have to re-choose their department and week of interest over and over. We also wanted icon tabs to link to the next page/dashboard. Those tab icons are built as LookML dimensions that carry the hyperlink with filters for that dashboard. I've used liquid variable filters with 2 values but never with this many. It was a challenge and required some time chatting with Looker support. Initially, the filters were forcing a value into each of the 13 available instead of leaving nulls where no filter value was set. The week filter is my original liquid filter methodology, and the others are done in such a way that they don't force a value entry....