When a planet build queue is empty and the manufacturing is set to zero then there will be no "Idle colony" on the turn button.
How to reproduce:
- Rush buy an improvement and have no other items in the build queue;
- Set the manufacturing to zero, for example set it to 100% wealth or research;
- Advance to the next turn;
- The build queue will now be empty, but you will not be notified of this on the turn button. Therefor the game allows you to advance to the next turn without having an active item in the build queue.
Especially if you are maximizing the efficiency for the Terrans, whom get their first building rush bough for them, by setting the production wheel to either 100% research or wealth in the first turn after colonization to grab some extra free income/research, this easily leads to that you might forget to actually have the planet do something useful in the next turn.
