Error if hex colour is not in colour list

[ogaskell]

When the hex colour passed to print() is not in the list in colors.py, the script fails with error UnboundLocalError: local variable 'code' referenced before assignment, since the line which sets code never runs as it doesn't find the passed hex colour in the colours.py file.

I'd suggest adding a statement which checks if code hasn't been assigned after it has looped through colours, and can approximate a colour in some way if necessary.

[ogaskell]

This also occurs with names colours, if it is not in the list.