No spouse indicator

You can set as a standard flag under Other Information the No Couple Relationships fact:

When you add this, you are prompted to put documentation as to why this is known:

Using this to record your previous research means,you will not have to redo research.

The ordinance list for someone who does not have a spouse does not actually say it is needed. It says it cannot be done because it is not available:

It is the same color but has a different message as the Needs More Information notice.