The access of a non-existing property should return null

[saig0]

Describe the bug
If I access a non-existing property of value (e.g. the seconds of a years and months duration), the engine returns a failure. But it should be more friendly and return null instead.

To Reproduce
Steps to reproduce the behavior:

1. Evaluate the following expression

@"P1Y".seconds

2. Verify that the engine returns a failure:

failed to evaluate expression '@"P1Y".seconds': No property found with name 'seconds' of value 'P1Y'. Available properties: years,months

Expected behavior
According to the DMN spec, the access of a non-existing property should return null.

(DMN 1.5, chapter 10.3.2.15, page 133)

• Related TCK test case: 0074-feel-properties
• Related issue: #674

Environment

• FEEL engine version: 1.16
• Affects:
  • Camunda Automation Platform 7: [7.x]
  • Zeebe broker: [0.x]