Empty values are shown as null instead of [Empty] in activity section

[RC19]

Normally when any field is changed to empty value then it will show in activity section as below:

• Assigned to              [Empty] was Bernard Laboy 

But in my other instance it is showing up as below

• Assigned to              null was Bernard Laboy 

instead of [Empty] it is displaying as null. Have anyone faced such issues and what could be the cause?

[Chris Cardenas]

I can confirm the issue was resolved after we upgraded our instance to Yokohoma Patch 5.