Save as empty value, when trying to save undefined var to local storage (#1443)

* Save empty value, when trying to save undefined var to localstorage

* Lint fix

* Newline at the end of file to satisfy linter?

* Linter again

src/hooks/useLocalStorage.ts

@@ -9,6 +9,8 @@ export default function useLocalStorage<T>(
     try {
       if (typeof valueToStore === "string") {
         localStorage.setItem(key, valueToStore);
+      } else if (typeof valueToStore === "undefined") {
+        localStorage.setItem(key, "");
       } else {
         localStorage.setItem(key, JSON.stringify(valueToStore));
       }