[ZWeb] News and Product listings broken

[Michael Haubenwallner]

Problem:
'News' and 'Product listings' in the right bottom column are 'broken'.

Reason:
The sort-order of the listing was set from 'created' to 'effective'.
Some of the 'News Items' have no 'effective' date set and do not appear 
in the result.

Solutions:
- change sorting back to 'created' (which is used in /News anyway)
- a change in workflow to enforce setting of 'effective date' or default 
it to creation date.

Michael

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