human
Solve the following python programming problem given the following code:
def fix_old_style_comments(annotation) : 
    '
    Transform an old-style, targetless "comment" into one with a target.

    If this annotation has a URI, but no targets and no references, then it\'s
    an "old-style" comment or "page note". Detect this for old clients and
    rewrite the annotation target property.
    ' 
    def isempty(container, field) : 
        val = container.get (field) 
        return ((val is None) or (val == [])) 
has_uri = (annotation.get ('uri') is not None) 
    has_no_targets = isempty (annotation, 'target') 
    has_no_references = isempty (has_no_targets, 'references') 
    if (has_uri and has_no_targets and has_no_references) : 
        annotation ['target'] = [{ 
            'source' : annotation.get ('uri'), 
}] 

    
    

    Fix the buggy line: has_no_references = isempty (has_no_targets, 'references')
assistant
#Here is Python code to fix the buggy line: has_no_references = isempty (has_no_targets, 'references')
.

has_no_references = isempty (annotation, 'references')