Fix potential NPE

Gaetan Boismal

29.39.2016 4335818b240f4dd9a180de307c6b22838a188519

Fix potential NPE

Add null check to ensure that the logger configuration manager is available before using it.
This would fix some potential NPE if server failed to start for example.

 opendj-server-legacy/src/main/java/org/opends/server/loggers/ErrorLogger.java

@@ -169,7 +169,7 @@
  private void adjustJulLevel()
  {
    final ServerContext serverContext = getServerContext();
    if (serverContext != null)
    if (serverContext != null && serverContext.getLoggerConfigManager() != null)
    {
      serverContext.getLoggerConfigManager().adjustJulLevel();
    }