Suppress markers at a particular location

I've constructed a map using IPGV&M and Leaflet API; data is held in Geofield; view is a block -- and I'm editing the specific view not the master view.

I have two fields being mapped: Location1 and Location2. The content filter ensures that Location1 is always a valid location, but I want to suppress markers on Location2 if the lat/long are 0.1/01. (it would be a bonus if I could suppress the markers on Location1 by the same criteria.)

I've tried adding a Location Differentiator that looks for lat/long = 0.1/0.1 and associates the no marker style but it doesn't 'stick' when I save the view.

What am I doing wrong?