don't require logging if log file is not set

src/lib/utils/log.cpp

@@ -175,6 +175,9 @@ void closeLogFile() {
 }
 
 bool needsLog(const LogFacility facility, const LogLevel level) {
+  if (s_logFile == nullptr && !s_useSyslog) {
+    return false;
+  }
   return s_facilityLogLevel[facility] >= level;
 }