Bugfix/FOUR-7123: Error when the select list has PMQL configured

[agustinbusso]

Issue & Reproduction Steps

• Create a Screen
• Config the select list with PMQL
• Press preview button

Expected behavior: No error should appear when the select list is configured by PMQL

Actual behavior: Error on the top appear when the select list is configured by PMQL. As show in the video

Solution

• Validate if screen exists before access getDataReference

Working video

https://user-images.githubusercontent.com/90727999/203821684-3c165f30-0477-4a3a-b936-ab80d9ae3405.mov

How to Test

Test the steps above

Related Tickets & Packages

• FOUR-7123

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.