On Saturday, January 2, 2016 at 6:16:15 PM UTC-8, David Allen wrote:
>
> <$list filter="[tag[species]planet{!!planet}]" > 
>
Does anyone know what I need to change to keep this from grabbing species 
> that don't have the planet field?
>

Try adding the "has[fieldname]" filter, like this (untested):

<$list filter="[tag[species]has[planet]planet{!!planet}]" >

enjoy,
-e

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