Fix an issue uncovered by !57465 (merged) and currently blocking that MR.
The ComponentAccumulator LegacySupport functions converting GaudiConfig2 components to old Configurables already take care of converting property value of type
GaudiConfig2.semantics._ListHelper to python built-in
CondInputLoader.Load property uses the
OrderedSet<std::vector<std::string> > semantics which translate to a python
lists in old config and to
_ListHelper holding a list of other
_ListHelper instances in conf2. This nested helper structure causes a crash seen in the pipeline !57465 (comment 6086303) because the current conversion only translates it to
_ListHelpers rather than
To fix this, ensure the convesion from conf2 "Helpers" is recursive.
Tagging CA config experts @tbold, @tadej, @wlampl. It's a mystery to me how we haven't run into this until now.