Bimlas

I wonder if this subtle fact could make a difference.

has[tags] asks if there is a non empty tags field. And thus !has[tags] is a 
double negative not non empty. I find it safer to use has:field[tags] will 
return if it exists at all, with a value or not. The negation should indicate 
there is no tags field at all. 

Regards
Tony

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