EDIT

            try{

                String item = list.getItem(index);

                if (item.equals(serverSidePreference)) {

                    return;

                }

                list.remove(index);

                int size = list.getItemCount();

                if (size == 0) { //Nothing's left, disable removing.

                    removeButton.setEnabled(false);

                } else { //Select an index.

                    if (index == size) {

                        //removed item in last position

                        index--;

                    }

                    list.setSelection(index-1);

                    preferencePage.setApply(true);

                }

            }catch(IllegalArgumentException iae){

                //nothing was selected

                return;