De Montfort University Harvard Style Update help

I have made some corrections to the De Montfort University - Harvard csl (mainly on how editors of books are managed when the item type is Book Section), but I am stuck with this problem:
If an article has no page number it should be treated as an online source and show doi or url, I have made some attempts at testing the variable "page" but didn't achieve anything.
Can somebody help please (my coding skills are very limited)?
Example
when the page number is not available the bibliography should show:

HEUS, T. and JONKER, H.J.J. (2008) Subsiding shells around shallow cumulous clouds. Journal of atmospheric sciences. [Online] 65 (3). Available from: doi:org/10.1175/2007Jas2322.1 [Accessed 28/06/16].
(with either doi or url whatever available)

what it shows at the moment is:

HEUS, T. and JONKER, H.J.J. (2008) Subsiding shells around shallow cumulous clouds. Journal of atmospheric sciences. 65 (3).
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