fix TestRemovedCronTask panic on 1.2-dev

[w-zr]

What type of PR is this?

• API-change
• BUG
• Improvement
• Documentation
• Feature
• Test and CI
• Code Refactoring

Which issue(s) this PR fixes:

issue #16053

What this PR does / why we need it:

cron task may be deleted in table when scheduling it in memory.

[matrix-meow]

@w-zr Thanks for your contributions!

Pull Request Review:

Title:

The title of the pull request is clear and concise, indicating that the PR is fixing a bug related to the TestRemovedCronTask panic on version 1.2-dev.

Body:

The body of the pull request provides relevant information such as the type of PR (BUG), the specific issue it fixes (#16053), and the reason for the PR. It mentions that the cron task may be deleted in the table when scheduling it in memory.

Changes:

1. In the task_service_cron.go file, a check has been added to ensure that if the length of cronTasks is 0, an error message is logged indicating that the cron task was not found, and the function returns early.

Feedback and Suggestions:

1. Error Handling Improvement:

   • The added check for len(cronTasks) == 0 is a good addition to prevent further processing when the cron task is not found. However, instead of just logging an error, it might be beneficial to return an error or handle the situation more gracefully depending on the context.

2. Logging Enhancement:

   • Consider providing more detailed information in the log message when the cron task is not found. Include additional context or potential reasons for the task not being present.

3. Code Optimization:

   • Instead of having a separate check for len(cronTasks) == 0 followed by another check for len(cronTasks) != 1, you could combine these conditions to improve readability and reduce redundancy.

4. Security Concern:

   • While not directly related to the changes in this PR, ensure that sensitive information such as task details are not exposed in logs. Make sure to handle logging of sensitive data securely to avoid potential security risks.

5. Testing:

   • It would be beneficial to include test cases that cover scenarios where the cron task is not found to validate the behavior and ensure the fix works as expected.

6. Documentation Update:

   • If this change impacts the behavior of the system or the usage of the cron tasks, consider updating the relevant documentation to reflect the new handling of missing cron tasks.

Overall, the changes in the pull request address the bug related to the TestRemovedCronTask panic effectively. By incorporating the suggestions provided, the code quality, error handling, and overall robustness of the system can be further improved.