Port away from deprecated KMessageBox::sorry
See frameworks/kwidgetsaddons!142 (merged) (merged) for the motivation.
Note how 2 places are proposed to be an information instead, as one could argue this is not an error, but a normal result:
- "No instances of '%0.7.1' found" in Finder::advance()
- "No errors matching given criteria were found!" in ErrorFinder::advance(bool)
Replacement API exist in older KF API, so no version checks needed.