MT - tenant bootstrap nows runs in 'System' ctx (rather than tenant 'admin' ctx) + minor cleanup.

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@8137 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/tenant/SingleTDeployerServiceImpl.java

@@ -24,6 +24,7 @@
  */
 package org.alfresco.repo.tenant;
 
+import java.util.ArrayList;
 import java.util.List;
 
 import org.apache.commons.logging.Log;
@@ -56,6 +57,6 @@ public class SingleTDeployerServiceImpl implements TenantDeployerService
     
     public List<Tenant> getAllTenants()
     {
-        return null;
+        return new ArrayList<Tenant>(0); // empty list
     }
 }