mappings/VegCore-VegBIEN.csv: subplot locationevent: Only populate parent locationevent's location unique IDs if a subplot #/subplotID is actually specified. (The lack of a location unique ID will cause the parent locationevent's location to be removed, as well as the parent locationevent itself if there is no parent locationevent unique ID.) This fixes a bug where top-level plots in datasources that provide a nullable subplot #/subplotID were incorrectly getting connected to parent locationevents.
mappings/VegCore-VegBIEN.csv: subplot locationevent: Only populate parent locationevent's location unique IDs if a subplot #/subplotID is actually specified. (The lack of a location unique ID will cause the parent locationevent's location to be removed, as well as the parent locationevent itself if there is no parent locationevent unique ID.) This fixes a bug where top-level plots in datasources that provide a nullable subplot #/subplotID were incorrectly getting connected to parent locationevents.