calling a function in p results in: `po.predicates.forEach is not a function`

[ssulyok]

Issue type: 🐛 Bug

Description

when using a function for a predicate, parsing fails with error: TypeError: po.predicates.forEach is not a function

funnily enough, using this approach in subject or object works

Steps

using dummy data:

input data:

{
    "persons": [
        {
            "firstname": "John",
            "lastname": "Doe",
            "male": true
        },
        {
            "firstname": "Jane",
            "lastname": "Smith",
            "male": false
        },
        {
            "firstname": "Sarah",
            "lastname": "Bladinck",
            "male": false
        }
    ]
}

prefixes:
 ex: "http://example.com/"
 grel: "http://users.ugent.be/~bjdmeest/function/grel.ttl#"

mappings:
  person:
    sources:
      - ['data.json~jsonpath', '$.persons[*]']
    s: http://example.com/$(firstname)
    po:
      - [a, foaf:Person]
      - [ex:name, $(firstname)]
      - p:
          function: grel:controls_if
          parameters:
            - [ grel:bool_b, $(male) ]
            - [ grel:any_true, ex:notApplicable~iri ]
            - [ grel:any_false, ex:myTest~iri ]
        o:
          function: grel:controls_if
          parameters:
            - [ grel:bool_b, $(male) ]
            - [ grel:any_true, ex:myTest~iri ]
            - [ grel:any_false, "SHE IS FEMALE" ]

expected behaviour should be:

if male = true, the po pair should be mapped as ex:notApplicable ex:myTest
if male = false, the po pair should be mapped as ex:myTest "SHE IS FEMALE"

could be related to #206

Environment

Add the version of Java and OS that is used.
=====> Java17 - Windows - yarrrml-parser v.1.11.0