There is no way to create a trigger that checks for a non-empty list. You will need to trigger on existence of an attribute or match something else and then perform additional tests n the body of the pattern.
To bad, that was what I was afraid of... Well I will just have to figure out some other way of matching it as you say. Thanks!
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You quite possibly can trigger on whether your attribute exists. Just because an attribute is declared in the taxonomy, it doesn't necessarily have to exist on a node. If nothing at all sets the attribute, it won't exist. The taxonomy doesn't have any bearing on how patterns trigger.
Well in that case I believe that this particular attribute is always set by the standard pattern. Its a standard BMC attribute (so nothing custom) and even though it is empty it seems to exist anyway. Maybe the pattern can be optimized, I will send it to the support.
Thanks for the pointer