VSO - JS crashing when viewing by Event Start Date

[mpugh]

When grouped by Event Start Date, Indico is trying to parse the startDate param of each booking whereas, for this index, the bookings do not have a concept of their associated event (except EVO it seems) and, therefore, was attempting a parsing of a subset of an empty string.

Other indexes are fine as they refer to the times of modification or creation of the bookings themselves, not the events to which they are linked.

[jbenito]

7de66729d010e13cf97f71e7b47af2e54a3b9c4d