Update HDRP changelog

com.unity.render-pipelines.high-definition/CHANGELOG.md

 - Fixed compilation errors on Nintendo Switch (limited XRSetting support).
 - Fixed apply range attenuation option on punctual light
 - Fixed issue when using more than one volume mask texture with density volumes.
+- Fixed an error which prevented volumetric lighting from working if no density volumes with 3D textures were present.
 
 ### Added
 - Add option supportDitheringCrossFade on HDRP Asset to allow to remove shader variant during player build if needed