It appears that you are trying to get rid of the Cummulative_Variance pane when the parameter is set to No? If that is case, the situation you are running into is that Tableau is always drawing the pane because Cummulative_Variance is a continuous measure and Tableau is drawing an axis for that, even when the Cummulative_Variance field is Null for every row. When you add the filter based on the parameter, then you are filtering out the entire view.
The workaround is to use a dashboard with the two charts, and not show the worksheet for Cummulative_Variance when the parameter is set to No. I've set this up in the attached.
RBS_Budget_Test jtd edit.twbx.zip 114.3 KB