WHSumm overwriting all (not just Publisher Feed) pixel data if publisher data present

The WarehouseSummarixer.setTotals() method does a check for existing publisher feed data, and sets a boolean flag if it finds any. It then uses this boolean in a column-level "if" sql fragment when determining whether to overwrite pixel data with se data. However, it does nothing to restrict this to the publisher feeds distribution(s).

Tentative fix made in SVN Changeset #29196. This fix may have a problem if the number of distributions exceeds the length of a string that group_concat will return. Also, the distributions should come from configuration, not data presence (separate issue).