[GREENFOOT-372] Do something when isKeyDown is used with invalid key name
We should either:
\- lower-case the key name, to prevent isKeyDown("Left") being a problem \- throw an exception/print a stderr message when they ask about a key that doesn't exist, such as isKeyDown("UP") or whatever.
Issue metadata
- Issue type: Bug
- Priority: Medium
- Fix versions: 2.4.0