fix(response-body): remove download button when content is empty (#8579)

Co-authored-by: Vladimír Gorej <vladimir.gorej@gmail.com>

test/unit/setup.js

@@ -29,6 +29,11 @@ function setUpDomEnvironment() {
   }
   copyProps(win, window) // use UI's built-in window wrapper
   copyProps(window, global)
+  
+  // https://github.com/jsdom/jsdom/issues/1721
+  if (typeof global.window.URL.createObjectURL === "undefined") {
+    Object.defineProperty(global.window.URL, "createObjectURL", { value: () => "data:text/plain;base64,SGVsbG8sIFdvcmxkIQ==" })
+  }
 }
 
 setUpDomEnvironment()