Thank you both Inusuit and Grayfox ... you both basically said the same thing in response to my question, but this is the statement I was hoping/looking for: "When resting in the safety notch, there may be about 1/8" between the hammer and frame. Not nearly enough spring pressure there to set off a primer."
I was aware it would depend on the sensitivity of the primer and/or spring tension on the hammer, or both. I just wasn't sure if it was possible or not based on the design of that particular firearm.
Thanks again, jj.