Fix account controller + coverage.

app/Repositories/Account/AccountRepository.php

@@ -87,6 +87,16 @@ class AccountRepository implements AccountRepositoryInterface
         return true;
     }
 
+    /**
+     * @param Account $account
+     *
+     * @return Note|null
+     */
+    public function getNote(Account $account): ?Note
+    {
+        return $account->notes()->first();
+    }
+
     /**
      * Returns the date of the very last transaction in this account.
      *