Account for null driver during setup.

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/branches/openfire_3_5_1@10191 b35dd754-fafc-0310-a699-88a17e54d16e

src/java/org/jivesoftware/database/DbConnectionManager.java

@@ -817,7 +817,10 @@ public class DbConnectionManager {
     }
 
     public static String getTestSQL(String driver) {
-        if (driver.contains("db2")) {
+        if (driver == null) {
+            return "select 1";
+        }
+        else if (driver.contains("db2")) {
             return "select 1 from sysibm.sysdummy1";
         }
         else if (driver.contains("oracle")) {