Fix breadcrumb extraction when we have comments in the HTML

[lopuhin]

also might fix other extractions where comments are passed. See the breadcrumbs test, it fails with the following without the fix:

tests/test_breadcrumbs.py:69:                                                                                                                                                                 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
zyte_parsers/breadcrumbs.py:136: in extract_breadcrumbs                                                                                                                                       
    extract_breadcrumbs_rec(                                                                                                                                                                  
zyte_parsers/breadcrumbs.py:112: in extract_breadcrumbs_rec                                                                                                                                   
    extract_breadcrumbs_rec(                                                                                                                                                                  
zyte_parsers/breadcrumbs.py:85: in extract_breadcrumbs_rec                                                                                                                                    
    extract_text(node),                                                                                                                                                                       
zyte_parsers/utils.py:93: in extract_text                                                                                                                                                     
    node = input_to_element(node)                                                                                                                                                             
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
                                                                                                                                                                                              
node = <!---->                                                                                                                                                                                
                                                                                                                                                                                              
    def input_to_element(node: SelectorOrElement) -> HtmlElement:                                                                                                                             
        """Convert a supported input object to a HtmlElement."""                                                                                                                              
        if isinstance(node, HtmlElement):                                                                                                                                                     
            return node                                                                                                                                                                       
>       return node.root                                                                                                                                                                      
E       AttributeError: 'HtmlComment' object has no attribute 'root'                                                                                                                          
                                                                                                                                                                                              
zyte_parsers/api.py:20: AttributeError                                                                                                                                                        
================================================================================== short test summary info ===================================================================================
FAILED tests/test_breadcrumbs.py::test_extract_breadcrumbs[[comments1.html] - https://www.hurriyet.com.tr/yerel-haberler/ankara/abbden-balciya-ulus-yaniti-41547223] - AttributeError: 'Htm...
========================================================================== 1 failed, 301 passed, 9 xfailed in 0.56s ==========================================================================

[lopuhin]

Thanks for review @Gallaecio and @kmike

[kmike]

a great catch @lopuhin!