ISTWCMS-4678: treat never-configured additions as enabled until selected otherwise
Please test that this does what I think it does, and doesn't have any ill effects.
On or around 4:30pm on Thursday, January 16th, git.uwaterloo.ca will be restarted to apply a configuration change that may result in a brief service interruption.
Please test that this does what I think it does, and doesn't have any ill effects.