Does the denial of the right to a jury trial on aggravating circumstances apply to harmless error analysis?

The denial of the right to a jury trial on aggravating circumstances is subject to harmless error analysis: "[I]f a reviewing court concludes, beyond a reasonable doubt, that the jury, applying the beyond-a-reasonable-doubt standard, unquestionably would have found true at least a single aggravating circumstance had it been submitted to the jury, the Sixth Amendment error properly may be found harmless." (People v. Sandoval, supra, 41 Cal.4th at p. 839.)