daf: fix add() handling of empty rule strings

diff --git a/modules/daf/daf.lua b/modules/daf/daf.lua
index 0ddb62b233dbd80c1281a3b369a6db87c614da06..282d03e92b318097fd37d38104f6910cc290d7db 100644 (file)
--- a/modules/daf/daf.lua
+++ b/modules/daf/daf.lua
@@ -75,6 +75,9 @@ end
 local function parse_rule(g)
        -- Allow action without filter
        local tok = g()
+       if tok == nil then
+               error('empty rule is not allowed')
+       end
        if not filters[tok:lower()] then
                return tok, nil
        end