Handle undefined data source

libs/common/src/lib/helper.ts

@@ -15,9 +15,13 @@ export function capitalize(aString: string) {
 }
 
 export function decodeDataSource(encodedDataSource: string) {
+  if (encodedDataSource) {
     return Buffer.from(encodedDataSource, 'hex').toString();
   }
 
+  return undefined;
+}
+
 export function downloadAsFile({
   content,
   contentType = 'text/plain',