Hide the total column if only one group is renderered

[jwildfire]

Rendering the total column is a bit confusing, since it is identical to (and thus overwrites) the group point in this case.

[jwildfire]

Test Notes: Confirm that total column is automatically hidden with settings: {"groups":["Placebo"]}, but not with {"groups":["Placebo","Treatment A"]}

[brittsikora]

Pass

{"groups":["Placebo"]}

{"groups":["Placebo","Treatment A"]}