no fallar si el articulo no tenia metadatos geo

app/models/metadata_geo.rb

@@ -7,7 +7,7 @@ class MetadataGeo < MetadataTemplate
   end
 
   def empty?
-    value == default_value
+    self[:value].nil? || value == default_value
   end
 
   def to_param
@@ -15,9 +15,13 @@ class MetadataGeo < MetadataTemplate
   end
 
   def save
+    return true if empty?
+
     self[:value] = {
       'lat' => self[:value]['lat'].to_f,
       'lng' => self[:value]['lng'].to_f
     }
+
+    true
   end
 end