This issue is automatically created based on existing pull request: #37479: Avoid divide-by-zero fatal error

Description

While working on Ethan3600/magento2-CronjobManager#122, I noticed that providing asking Magento to validate a cron expression which contains /0 resulted in a Fatal error, rather than an exception which I could catch. This pull request fixes the divide-by-zero bug and instead produces a sensible exception. Includes unit test.

Manual testing scenarios

1. Call \Magento\Cron\Model\Schedule::matchCronExpression('0/0', 0)

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)