When an annotation has only a single, null-named feature, don't display "null" in the field; display annotation name = null feature value.
| configuration |
example |
| Single null-named feature: |
transactivity=3 |
| No feature |
transactivity |
| Named features |
transactivity (measure1=3, measure2=7) |
| Both named and null feature |
transactivity=5 (measure1=3, measure2=7) |