Web Crawler help

[takaa]

Another question, this time about None Type.

I made another function in the crawler to get another piece of info. 

def get_single_item_data_3(item_url):
    source_code = requests.get(item_url)
    plain_text = source_code.text
    soup = BeautifulSoup(plain_text, 'html.parser')
    uls = soup.find_all('ul', {'class': 'labels'})
    for ul in uls:
            return(ul.find('li').text.strip())

If i only print out this function the result is:

Output:
Nieuw
Nieuw
None
None
None
None
None
None
None

If i put this output in the string with my other results i get an error for the first " None" return:

Error:
TypeError: Can't convert 'NoneType' object to str implicitly

I tried several things to only let the function return a result if the result is not None. But without success. For example, if i call the function like this:

            if get_single_item_data_3(href) is not None:
                status = get_single_item_data_3(href)
            print(status)

the result is on each row " nieuw" (output of the first item). 

If i put the if statatement in the function like this:

def get_single_item_data_3(item_url):
    source_code = requests.get(item_url)
    plain_text = source_code.text
    soup = BeautifulSoup(plain_text, 'html.parser')
    uls = soup.find_all('ul', {'class': 'labels'})
    for ul in uls:
        if get_single_item_data_3(item_url) is not None:
            return(ul.find('li').text.strip())

Nothing is happening (i interrupted). 

Error:
  
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/bs4/__init__.py", line 228, in __init__
    self._feed()
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/bs4/__init__.py", line 289, in _feed
    self.builder.feed(self.markup)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/bs4/builder/_htmlparser.py", line 167, in feed
    parser.feed(markup)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/html/parser.py", line 111, in feed
    self.goahead(0)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/html/parser.py", line 173, in goahead
    k = self.parse_endtag(i)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/html/parser.py", line 422, in parse_endtag
    self.clear_cdata_mode()
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/html/parser.py", line 128, in clear_cdata_mode
    self.interesting = interesting_normal
KeyboardInterrupt

How can I print the output of my function (def get_single_item_data_3) in a string together with my other outputs, while ignorning the items that have a NoneType?