filter zero values from getting rendered

Kicks a few thousand markers, so helps with GH #14

Makefile

@@ -21,9 +21,9 @@ clean:
 	find . -name "*.pyc" -delete
 	find . -name ".DS_Store" -delete
 
-# make sure to install the hstore extension in template1
+# Note: make sure to install the hstore extension in template1
 test:
-	ENVIRONMENT=test $(MANAGE) test
+	$(MANAGE) test
 
 
 resetdb:

mixed_beverages/apps/lazy_geo/views.py

@@ -2,6 +2,7 @@
 
 from django.contrib.admin.views.decorators import staff_member_required
 from django.core.urlresolvers import reverse
+from django.db.models import Q
 from django.http import (
     HttpResponseBadRequest, JsonResponse, HttpResponseRedirect,
     HttpResponseForbidden,
@@ -37,7 +38,8 @@ def get(self, request, *args, **kwargs):
 
 
 class MarkerList(GeoJSONLayerView):
-    queryset = models.Location.objects.exclude(coordinate=None)
+    queryset = models.Location.objects.filter(coordinate__isnull=False).exclude(
+        Q(data__avg_tax='0') | Q(data__avg_tax='0.00'))
     geometry_field = 'coordinate'
     precision = 6
     properties = ('coordinate_quality', 'data',)