fixed bar chart not loading for campaign single building view

[s-egge]

• Issue was that the charts for this view do not have a "multStart", so it was trying to read an undefined value

[solderq35]

Looks good to me, e.g. on http://energy-dashboard.s3-website-us-west-2.amazonaws.com/#/campaign/10

[solderq35]

I forgot to use the actual Review button but consider this reviewed lol.