human
Solve the following python programming problem given the following code:
def build_list(li_nodes, meta_data) : 
    '
    Build the list structure and return the root list
    ' 
    ol_dict = { 
        
} 
    current_ilvl = (- 1) 
    current_numId = (- 1) 
    current_ol = None 
    root_ol = None 
    visited_nodes = [] 
    list_contents = [] 
    def _build_li(list_contents) : 
        data = '<br />'.join ((t for t in list_contents if (t is not None))) 
        return etree.XML (('<li>%s</li>' % data)) 
def _build_non_li_content(el, meta_data) : 
        w_namespace = get_namespace (el, 'w') 
        if (el.tag == ('%stbl' % w_namespace)) : 
            (new_el, visited_nodes) = build_table (el, meta_data) 
            return (etree.tostring (new_el), visited_nodes) 
else : 
            if (el.tag == ('%sp' % w_namespace)) : 
                return (get_element_content (el, meta_data), [el]) 
if has_text (el) : 
            raise UnintendedTag (('Did not expect %s' % el.tag)) 
def _merge_lists(ilvl, current_ilvl, ol_dict, current_ol) : 
        for i in reversed (range (ilvl, current_ilvl)) : 
            if (i not in ol_dict) : 
                continue 
if (ol_dict [i] is not current_ol) : 
                if (ol_dict [i] is current_ol) : 
                    continue 
ol_dict [i] [(- 1)].append (current_ol) 
                current_ol = ol_dict [i] 
for key in list (ol_dict) : 
            if (key > ilvl) : 
                del ol_dict [key] 
return current_ol 
for li_node in li_nodes : 
        w_namespace = get_namespace (li_node, 'w') 
        if (not is_li (li_node, meta_data)) : 
            (new_el, el_visited_nodes) = _build_non_li_content (li_node, meta_data) 
            list_contents.append (new_el) 
            visited_nodes.extend (el_visited_nodes) 
            continue 
if list_contents : 
            li_el = _build_li (list_contents) 
            list_contents = [] 
            current_ol.append (new_el) 
list_contents.append (get_element_content (li_node, meta_data)) 
        ilvl = get_ilvl (li_node, w_namespace) 
        numId = get_numId (li_node,...

    
    

    Fix the buggy line: current_ol.append (new_el)
assistant
#Here is Python program to fix the buggy line: current_ol.

current_ol.append (li_el)