[PATCH] Ensure that loop always receives an array even if only one series

[dinkypumpkin]

On 13/03/2012 16:30, Mike Crowe wrote:
> Similar to fee90b0f902a75d87022f91ef7978b17cfa00625, this fixes a
> runtime error on pid b01d8jmz:

Committed to Git repo.  Thanks.