create dataset from filtered data, to avoid showing rows without data

compendium-frontend/src/pages/Organization/FundingSource.tsx

@@ -116,15 +116,11 @@ function FundingSourcePage() {
   const { filterSelection, setFilterSelection } = useContext(FilterSelectionContext);
   const { data: fundingSourceData, years, nrens } = useData<FundingSource>('/api/funding/', setFilterSelection);
 
-  const fundingSourceDataset = createFundingSourceDataset(fundingSourceData);
-
   const selectedData = fundingSourceData.filter(data =>
     filterSelection.selectedYears.includes(data.year) && filterSelection.selectedNrens.includes(data.nren)
   );
 
-  fundingSourceDataset.datasets.forEach(dataset => {
-    dataset.hidden = !filterSelection.selectedYears.includes(parseInt(dataset.stack));
-  });
+  const fundingSourceDataset = createFundingSourceDataset(selectedData);
 
   // remove the datapoints and labels for the nrens that aren't selected
   // unfortunately we cannot just hide them because graph.js doesn't want