human
Solve the following python programming problem given the following code:
def _get_or_update_cases(xforms, case_db) : 
    '
    Given an xform document, update any case blocks found within it,
    returning a dictionary mapping the case ids affected to the
    couch case document objects
    ' 
    domain = getattr (case_db, 'domain', None) 
    touched_cases = FormProcessorInterface (domain).get_cases_from_forms (case_db, xforms) 
    def _validate_indices(case) : 
        if case.indices : 
            for index in case.indices : 
                referenced_case = case_db.get (index.referenced_id) 
                if (not referenced_case) : 
                    logging.error ("Case '%s' references non-existent case '%s'", case.case_id, index.referenced_id) 
def _get_dirtiness_flags_for_outgoing_indices(case, tree_owners = None) : 
        ' if the outgoing indices touch cases owned by another user this cases owner is dirty ' 
        if (tree_owners is None) : 
            tree_owners = set () 
extension_indices = [index for index in case.indices if (index.relationship == CASE_INDEX_EXTENSION)] 
        unowned_host_cases = [] 
        for index in extension_indices : 
            host_case = case_db.get (index.referenced_id) 
            if (host_case and (host_case.owner_id == UNOWNED_EXTENSION_OWNER_ID) and (host_case not in unowned_host_cases)) : 
                unowned_host_cases.append (host_case) 
owner_ids = ({ case_db.get (index.referenced_id).owner_id for index in case.indices if case_db.get (index.referenced_id) } | tree_owners) 
        potential_clean_owner_ids = (owner_ids | set ([UNOWNED_EXTENSION_OWNER_ID])) 
        more_than_one_owner_touched = (len (owner_ids) > 1) 
        touches_different_owner = ((len (owner_ids) == 1) and (case.owner_id not in potential_clean_owner_ids)) 
        if (more_than_one_owner_touched or touches_different_owner) : 
            (yield DirtinessFlag (case.case_id, case.owner_id)) 
            if extension_indices : 
                for index in case.indices : 
                    referenced_case = case_db.get...

    
    

    Fix the buggy line: return CaseProcessingResult (domain, [update.case for update in touched_cases.values ()], case_update_meta, extensions_to_close)
assistant
#Here is Python code to fix the buggy line: return CaseProcessingResult (domain, [update.

return CaseProcessingResult (domain, [update.case for update in touched_cases.values ()], dirtiness_flags, extensions_to_close)