We have a field displayed as a line on a bar chart on a dashboard that depends on a user specifying attributes. If the user doesn’t choose a value, we’d like to hide this field from the visualization. Despite the value being null in the backend, the bar chart is plotting a line for the null values as if it were valued at 0. Is it possible to dynamically toggle whether a field like this is displayed in the visualization depending either on the values of the data or on something like a dashboard filter?