Bypass 'noelementfound' in selenium python

Hi I am surprised to see my code is not working fine, and I am still not able to fix or find the root casuse.

  driver.find_element_by_xpath(Client.lnk_client_existing).click() 
 

I want to bypass this element when there is no value, I want to click only when its available.

Tried different ways yet I am not able to fix issue.