GeezerVison

When I created this emulator, I only tested it with a "commands" file which only contained one command but when I actually tried to use it with more commands I found out that only the first command was passed. Turns out that the doRead() function of the base class always returns null, independently of whether it correctly read some data or not, so the check for the return value always failed 🤦 Turns out that this check is not really needed and checking if the connection has been closed is enough

The explanation is much longer than the fix! 😆