According to these guys: http://handgunlaw.us/states/kentucky.pdf, there is no duty to inform the officer.
The law you cite (KRS 237.104(2)) only applies during times of emergency. "Officer safety" is a dubious term that is often still used at other times by officers who are scared in inanimate objects. Most courts have ruled it is acceptable still, and this is one of the many reasons that those of us in non-shall-inform states just keep our mouth shut or decide based on other circumstances.
Modern single-action revolvers like the Rugers from my generation are safe. Older designs (which are still made today by many companies) like the Colt Single-Action Army, and older Rugers need the extra safety of an empty charge hole in the cylinder. Modern guns have firing pin blocks, transfer bars, or hammer blocks and other safeties that prevent the gun from discharging even if you purposely hit the back of the hammer with a, with a, with a, well..., with a hammer.