If using the program without a turbine and you select part of the GUI that would transition you to the Turbine screen the program will crash. This adjusts the program so that it will switch between Status and Reactor screens only when no turbines exist.
Thank you for finding and reporting this issue and even more thanks for the Pull Request. :) I'll roll this into the next release once I'm back from business travel in a week.
If using the program without a turbine and you select part of the GUI that would transition you to the Turbine screen the program will crash. This adjusts the program so that it will switch between Status and Reactor screens only when no turbines exist.