Fix: https://processmaker.atlassian.net/browse/FOUR-4849

Issue:

• Exception Cannot read properties of null on visibility rules, breaks all the rules
• Bind control to property of null, break all the screen.

Fix:

• Try/Catch visibility rules for each rule
• Add a computed property (getter/setter) to proxy the field names

How to test

• Import the attached screen
• Select/Unselect the person Select List
• When person is not selected (value=null) it breaks the screen

FOUR-4849.zip