fixed lua default in packet capture

diff --git a/src/network_inspectors/packet_capture/capture_module.cc b/src/network_inspectors/packet_capture/capture_module.cc
index 410e82f70cd1ea289a5e9433a8206976e2b6e2d4..dfe0000d4cd22ebdda406d7401283a8f787736bf 100644 (file)
--- a/src/network_inspectors/packet_capture/capture_module.cc
+++ b/src/network_inspectors/packet_capture/capture_module.cc
@@ -41,7 +41,7 @@ static const Parameter s_capture[] =
     { "enable", Parameter::PT_BOOL, nullptr, "false",
       "initially enable packet dumping" },
 
-    { "filter", Parameter::PT_STRING, nullptr, "",
+    { "filter", Parameter::PT_STRING, nullptr, nullptr,
       "bpf filter to use for packet dump" },
 
     { nullptr, Parameter::PT_MAX, nullptr, nullptr, nullptr }