Improve LookupError
Previously, when you did click("non-existent") you received a LookupError without further information. Now, you get LookupError: "non-existent". Similarly for other actions. This makes debugging easier.
Previously, when you did click("non-existent") you received a LookupError without further information. Now, you get LookupError: "non-existent". Similarly for other actions. This makes debugging easier.