Force load of MagneticFieldSvc in DetDesc mode
With changes like Lbcom!607 (merged) and Rec!2860 (merged) the MagneticFieldSvc
is not instantiated on demand, but it is still needed to be able to have the special DeMagnet
condition (!3107 (merged)).
This change makes sure that MagneticFieldSvc
is always present when using PyConf configuration.
Requires Run2Support!28 (merged)
Edited by Sebastien Ponce