"charge" crashes if a scenario is disabled

[jeremysmyth]

I get a crash when running an accountreport that references a charge ... perhour on a task when there is an inactive scenario, even if the accountreport does not use that scenario:

Fatal: Interval start must be a date, not a NilClass

This apparently happens because charge ... perhour requires that the task has a scheduled start and end, which of course doesn't happen for inactive scenarios.

I can work around it by either:

• Scheduling the baseline scenario with active yes, or
• Specifying actual:charge ... perhour for the active scenario "actual"