Web scraping of coreyms.com

Question

When I scrap the posts of website coreyms.com using BeautifulSoup, i.e., the heading, date, content and youtube link of the posts, I am facing this problem: all posts except one contains youtube link. So when I scrap the data, len(videolink)=9 and len(heading),len(date),len(content)=10. How can I make the len(videolink)=10 by inserting NaN in the post where youtube link is not present?

The code is given for reference:

from bs4 import BeautifulSoup
import requests
page7=requests.get('https://coreyms.com/')
page7
soup7=BeautifulSoup(page7.content)
soup7

heading=[]

for i in soup7.find_all('h2',class_='entry-title'):
    heading.append(i.text)
    
heading

date=[]

for i in soup7.find_all('time',class_='entry-time'):
    date.append(i.text)
    
date

content=[]

for i in soup7.find_all('div',class_='entry-content'):
    content.append(i.text)
    
content

videolink=[]

for i in soup7.find_all('iframe',class_='youtube-player'):
    videolink.append(i['src'])
    
videolink

print(len(heading),len(date),len(content),len(videolink))