dnsdist: The second parameter to `setAPIWritable()` is optional

This was broken 93cd7bf30d and not noticed because our regression
tests provide the optional parameter.

diff --git a/pdns/dnsdistdist/dnsdist-lua.cc b/pdns/dnsdistdist/dnsdist-lua.cc
index 233f7a6da23f58b8cfcb960e6ee37dac2913a09d..c7c19071d2016247aa0a41fe168e5c506fa3d782 100644 (file)
--- a/pdns/dnsdistdist/dnsdist-lua.cc
+++ b/pdns/dnsdistdist/dnsdist-lua.cc
@@ -1914,7 +1914,7 @@ static void setupLuaConfig(LuaContext& luaCtx, bool client, bool configCheck)
     }
     dnsdist::configuration::updateRuntimeConfiguration([writable, &apiConfigDir](dnsdist::configuration::RuntimeConfiguration& config) {
       config.d_apiReadWrite = writable;
-      if (!(*apiConfigDir).empty()) {
+      if (apiConfigDir && !(*apiConfigDir).empty()) {
         config.d_apiConfigDirectory = *apiConfigDir;
       }
     });