Avoid call the API when cron expression is empty

[LinuxSuRen]

As you can see, it's not necessary to call the API when cron expression is empty. You could find this page on the Pipeline editing page.

/kind bug
/area console
/good-first-issue

[ks-ci-bot]

@LinuxSuRen:
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In response to this:

As you can see, it's not necessary to call the API when cron expression is empty. You could find this page on the Pipeline editing page.

/kind bug
/area console
/good-first-issue

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[LinuxSuRen]

I'm not familiar with the front-end code base. What I can tell you is just the repository address.

https://github.com/kubesphere/console