svl: remove pointless catch around "delete" statement

In C++11 the destructors are implicitly noexcept so if any of the
subclasses of SfxUndoAction would have a throwing dtor we would have
found out by now.

Change-Id: I4e044f8c2c391464cdc236bac15465860fa0ef62

svl/source/undo/undo.cxx

@@ -381,14 +381,7 @@ namespace svl { namespace undo { namespace impl
         {
             SfxUndoAction* pAction = m_aUndoActionsCleanup.front();
             m_aUndoActionsCleanup.pop_front();
-            try
-            {
-                delete pAction;
-            }
-            catch( const Exception& )
-            {
-                DBG_UNHANDLED_EXCEPTION();
-            }
+            delete pAction;
         }
 
         // handle scheduled notification