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/clipboard/ClipboardBean.java

@@ -221,7 +221,7 @@ public class ClipboardBean
          // refresh UI on success
          UIContextService.getInstance(FacesContext.getCurrentInstance()).notifyBeans();
       }
-      catch (Exception err)
+      catch (Throwable err)
       {
          // rollback the transaction
          try { if (tx != null) {tx.rollback();} } catch (Exception tex) {}