I got a shell task in ansible that plays between if-else condition

Under if condition it prints echo 2 lines while in the else condition it prints a single line.

I need a generic debug print statement that prints for both if and else condition.

- name: Extract certificate or key information
  shell: >     
    if [[ "{{ certlocation }}" != *.key ]]; then
      cert_cn=$(openssl x509 -in "{{ certlocation }}" -noout -subject -nameopt sep_multiline)
      echo "~$cert_cn"
      cert_san=$(openssl x509 -in "{{ certlocation }}" -noout -ext subjectAltName)
      echo "~$cert_san"
    else
      cert_san=$(openssl x509 -in "{{ certlocation }}" -noout -ext subjectAltName)
      echo "~$cert_san"   
    fi
  register: cert_info
  delegate_to: localhost

- name: Print specific information
  debug:
    msg: |
      cert_cn: "{{ cert_info.stdout_lines[0].split('~')[1] | default('NA') }}"
      cert_san: "{{ cert_info.stdout_lines[1].split('~')[1] | default(cert_info.stdout_lines[0].split('~')[1]) }}"

I tried the above but it fails with the below error during the else condition which prints a single line:

TASK [Print specific informations] ***************************************************************************************************************************Monday 29 July 2024  23:51:46 -0500 (0:00:00.022)       0:00:00.517 ***********
fatal: [localhost]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: list object has no element 1nnThe error appears to be in '/home/wladmin/teststdoutlines.yml': line 17, column 7, but maynbe elsewhere in the file depending on the exact syntax problem.nnThe offending line appears to be:nnn    - name: Print lines using index from stdout_linesn      ^ heren"}

I was expecting upon failure that it would default to cert_info.stdout_lines[0].split('~')[1] which has a valid value.

Can you suggest how to handle such cases in ansible the right way?