This caused a bug in Lua Carousel. Scenario:

• Run carousel.love
• run the abbreviations screen which creates an abbreviation called color
• run driver.love

Before this commit, carousel.love would silently exit, and driver.love would then hang waiting for it to come back. The cause:

• driver.love sends MANIFEST
• in processing it, carousel.love calls color() to emit a color escape.
• the error silently quits the app

After restarting carousel.love, the error shows up in driver.love:

Error: live.lua:104: bad argument #3 to 'color' (number expected, got no value) stack traceback: [C]: in function 'color' live.lua:104: in function 'receive_from_driver' …