The script, executing "crontab -l", writes an error to the crontab file

For example, if the crontab file has not been created for the user, then “crontab -l” will display the message "no crontab for acme" with execution status "1" . The installcronjob function of the acme.sh script will write this text to the crontab file.
https://github.com/acmesh-official/acme.sh/blob/563415d21fea772b24c1d4703d5245ccb52ce232/acme.sh#L6277

To fix

`$_CRONTAB -l 2>/dev/null | { ...`


