Bugfix/FOUR-8447: Error to export process Empty

[agustinbusso]

Issue & Reproduction Steps

Please refer to: https://processmaker.atlassian.net/browse/FOUR-8447

Solution

• Show a friendly message to the user.

Working video

https://user-images.githubusercontent.com/90727999/236514988-cc28142c-0166-4a55-8693-920c5636c48f.mov

How to Test

• Create an empty process or add some elements and delete all of them.
• Go to Processes list and try to export it

You should see a friendly error message: 'Error: The process to export is empty.'

Related Tickets & Packages

• FOUR-8447

Code Review Checklist

• [ ] I have pulled this code locally and tested it on my instance, along with any associated packages.
• [ ] This code adheres to ProcessMaker Coding Guidelines.
• [ ] This code includes a unit test or an E2E test that tests its functionality, or is covered by an existing test.
• [ ] This solution fixes the bug reported in the original ticket.
• [ ] This solution does not alter the expected output of a component in a way that would break existing Processes.
• [ ] This solution does not implement any breaking changes that would invalidate documentation or cause existing Processes to fail.
• [ ] This solution has been tested with enterprise packages that rely on its functionality and does not introduce bugs in those packages.
• [ ] This code does not duplicate functionality that already exists in the framework or in ProcessMaker.
• [ ] This ticket conforms to the PRD associated with this part of ProcessMaker.

ci:deploy

[pmkerberos]

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