input: Write a python function to extract keywords from a given webpage.
  assert get_keywords_from_page('https://www.example.com') == 'example, sample, test'
  assert get_keywords_from_page('https://www.test.com') == 'test, example, try'
  assert get_keywords_from_page('https://www.nokeywords.com') == ''
output: def get_keywords_from_page(url):
      import requests
      from bs4 import BeautifulSoup
  
      response = requests.get(url)
      if response.status_code == 200:
          soup = BeautifulSoup(response.text, 'html.parser')
          meta_keywords = soup.find('meta', attrs={'name': 'keywords'})
          if meta_keywords:
              return meta_keywords.get('content', '').strip()
      return ''