LArADC2MeVCondAlg: Prepare to work with incomplete detector
@pavol decided to use the intermediate electronic calibration results to compute the pile-up auto-correlation during the LAr Electronic Calibration procedure. But the LArADC2MeVCondAlg wasn't really prepared to work with incomplete calibration sets, in particular
This MR updates the LArADC2MeVCondAlg to handle this situation (configurable). At the same time, fix the error reporting for incomplete input conditions (Ramp) when a complete detector is expected (eg the production case).