Fixed redirection issue in Admin-> Content -> Schedule

[dominicfernando]

Description (*)

Redirection issue when saving the Content -> Schedule. If an error occurs then always redirect to the grid section

Manual testing scenarios (*)

#1 - Goto Content -> Schedule -> Add Design Change
#2 - Create record with wrong data(wrong date range) and save

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)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-cicd2]

All committers have signed the CLA.

[magento-engcom-team]

Hi @dominicfernando. Thank you for your contribution
Here is some useful tips how you can test your changes using Magento test environment.
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[magento-engcom-team]

Hi @sidolov, thank you for the review.
ENGCOM-4110 has been created to process this Pull Request

[ghost]

Hi @dominicfernando, thank you for your contribution!
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