policy: fix incompatibility with default (nil) phase

The `{ nil }` would otherwise get interpreted as an empty table.

diff --git a/modules/policy/policy.lua b/modules/policy/policy.lua
index b1f55e16a0b9a8a4809c3b524da02d26ea560275..9db1fc68c62611e38d1848b25b6874fa43dc8aea 100644 (file)
--- a/modules/policy/policy.lua
+++ b/modules/policy/policy.lua
@@ -635,7 +635,7 @@ function policy.add(rule, phase)
        -- End of compatibility shim
        local desc = {id=getruleid(), cb=rule, count=0}
        if type(phase) ~= 'table' then
-               phase = {phase}
+               phase = {phase or 'begin'}
        end
        -- Allow multiple phases for the same rule
        for _, p in ipairs(phase) do