Fix in handling charged FEs in UFO energy per layer calculation
This MR is a follow-up of !60135 (merged) which caused some crashes in the ART tests for JETM1 and JETM2 where the energy-per-layer variables are calculated for small-R UFO CSSK jets.
The crash occurs when the underlying object of a combined UFO is a charged FE rather than a neutral FE. These charged FEs do not have the energy-per-layer information stored and therefore the code crashed. Instead, it is now checked if the otherObject
is a charged FE and its energy is added to the total energy.
In addition, small content changes are implemented for JETM2.
I'm marking this as urgent as I understood from @calpigia that a new release is imminent.