The thing is that in 3.8 the convert function is called with a :undefined value when the disk space cannot not be obtained instead of a :unknown value. So, testing for an :unknown value has no effect. I could not find the the exact code that explain this difference.
The thing is that in 3.8 the convert function is called with a :undefined value when the disk space cannot not be obtained instead of a :unknown value. So, testing for an :unknown value has no effect. I could not find the the exact code that explain this difference.