When there is no good building option for a system, you usually set it to a conversion option (e.g. industry to dust).

This option is infinite.


Without manually inspecting those systems, they will never appear in your reminder list again. 


This leads to tedious manual checking for new valid options on that system, as those systems get removed from the "empty construction queue" pop up.


This manual management is still fine on small galaxies, problematic on huge galaxies with many systems.


Suggestion:

When new system improvements are available, include systems currently on an infinite construction option into the pop-up reminder for empty construction queue.


That way, the player is always reminded that he might want to deactivate the infinite option and replace it with the newly researched system improvement.