Log a stupid message ("DANGER WILL ROBINSON") if the file_name_index or cgi_ext

string lists are detected as NULL - this is *still* occurring and I'm hoping
this log entry will help determine the cause.

src/sbbs3/websrvr.c

@@ -3611,6 +3611,9 @@ void http_session_thread(void* arg)
 	socket=session.socket;
 	lprintf(LOG_DEBUG,"%04d Session thread started", session.socket);
 
+	if(startup->index_file_name==NULL || startup->cgi_ext==NULL)
+		lprintf(LOG_DEBUG,"%04d !!! DANGER WILL ROBINSON, DANGER !!!", session.socket);
+
 #ifdef _WIN32
 	if(startup->answer_sound[0] && !(startup->options&BBS_OPT_MUTE)) 
 		PlaySound(startup->answer_sound, NULL, SND_ASYNC|SND_FILENAME);