Analysis Management Plugin should ignore\ not allow backfill of non-history Analyses. This will improve manageability.
In the management pane, one can select analyses and then queue for backfill, even if the analyses have no PIPoint Data Reference attribute outputs. This appears to take some processing. The management plugin should ignore these or even unselect with messaging that these analyses are not eligible for backfilling.
This comes up most often when users are doing a bulk backfill of analyses and do a select all of their analyses.
