[Minor] Don't try to use filtered results

diff --git a/src/plugins/lua/rbl.lua b/src/plugins/lua/rbl.lua
index 9f30760b66c05e6190792416dec2d85e64d1c1fb..01c12baef8ea774fb73f798b84465289ae3c1b05 100644 (file)
--- a/src/plugins/lua/rbl.lua
+++ b/src/plugins/lua/rbl.lua
@@ -333,7 +333,9 @@ local function rbl_cb (task)
             to_resolve = upart .. '.' .. email:get_host() .. '.' .. rbl['rbl']
           end
         end
-        gen_rbl_rule(to_resolve, rbl)
+        if to_resolve then
+          gen_rbl_rule(to_resolve, rbl)
+        end
       end
     end
   end,