Tidy up of UserTransaction roll back on throwable as opposed to Exception

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@2218 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/web/bean/repository/Repository.java

@@ -539,7 +539,7 @@ public final class Repository
          personNodes = Collections.<Node>emptyList();
          try { if (tx != null) {tx.rollback();} } catch (Exception tex) {}
       }
-      catch (Exception err)
+      catch (Throwable err)
       {
          Utils.addErrorMessage(MessageFormat.format(Application.getMessage(
                context, Repository.ERROR_GENERIC), err.getMessage()), err );