LArSoft

The current implementation of detinfo::DetectorClocksStandard requires the configuration of a default trigger time and a default beam gate opening time.
These times are recorded as "default" values but never used.
So far, it has been the duty of the art service (@detinfo::DetectorClocksStandardService`) to explicitly set the trigger and beam gate times to their default, which it does in a callback at every new event (and only if there is no raw trigger stored; otherwise, the time of that raw trigger is used instead of the default value).

My proposal is that the service provider on construction initialise the trigger and beam times with their configured default values, instead of initialising them to 0.0 as it currently happens.
This has almost no consequence when running in art (except if the service is accessed before the first run is processed), but it simplifies the initialisation of the service provider in environments, like gallery, which have no callback system.