Fix or indicate possible null pointer dereferencing detected by FindBugs

ludovicp

29.11.2008 aa4cddefb7237eea616db2b525539cc7c854d41a

 opends/src/server/org/opends/server/backends/jeb/VerifyJob.java

@@ -1798,7 +1798,7 @@
    DatabaseEntry presenceKey = AttributeIndex.presenceKey;

    // Presence index.
    if (!attrList.isEmpty() && presenceIndex != null)
    if ((attrList != null) && !attrList.isEmpty() && presenceIndex != null)
    {
      try
      {