我有这个代码：

import selenium.webdriver as webdriver
import time
import requests
from selenium.webdriver.chrome.options import Options
from usp.tree import sitemap_tree_for_homepage
import os
from selenium.webdriver.common.by import By
from urllib.parse import urlparse
from urllib.parse import parse_qs

options = Options()
options.add_argument('--allow-running-insecure-content')
options.add_argument('--ignore-certificate-errors')

driver = webdriver.Chrome()

sitemap = 'https://adesivimoto.eu/sitemap.xml'
next_pages = []

tree = sitemap_tree_for_homepage(sitemap)
for page in tree.all_pages():
    driver.get(page.url)
    print("visito "+page.url)
    time.sleep(2)
    
    if driver.find_element(By.CLASS_NAME, "next"):
        next_page = driver.find_element(By.CLASS_NAME, "next").get_attribute('href')
        next_pages.append(next_page)

for next_page in next_pages:
    print(next_page)
    
os.system("rundll32.exe powrprof.dll,SetSuspendState 0,1,0")

在代码显示next_page = driver.find_element(By.CLASS_NAME, "next")的地方，如果元素不可用，就会出现错误。我尝试使用if解决这个问题，但没有成功。我如何才能使is，以便如果元素不可用，代码就进入循环的下一次迭代？