Incompatibility multiple primaries associated to an event #356
Description
An obnoxious site effect of multiple primaries now being possibly associated to the same event (github.com/XENONnT/mc/pull/377). DECAY0 files won't run through as we didn't consider this situation in the past. For a potential solution we can limit to just one and pick the first by default (Lutz's idea), and as mentioned Daniel Wenz it would be a good idea to throw a warning at the user about this. Alternative suggestions would also be good.