Fixed NPE when destroying the plugin.

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/trunk@9276 b35dd754-fafc-0310-a699-88a17e54d16e

src/plugins/search/src/java/org/jivesoftware/openfire/plugin/SearchPlugin.java

@@ -123,7 +123,9 @@ public class SearchPlugin implements Component, Plugin, PropertyEventListener {
             componentManager = null;
         }
         catch (Exception e) {
-            componentManager.getLog().error(e);
+            if (componentManager != null) {
+                componentManager.getLog().error(e);
+            }
         }
         serviceName = null;
         userManager = null;