Improve the handling of parsing errors when loading a query

[tfrancart]

The query loading should be able to report (send an alert) on query loading error (e.g. property identifier not found), so that wrong queries from AI can be reported in the UI messages

Exemple triggering an error right now, which is unreported: "Museums in France displaying artworks from Italian painters"

{
    "branches": [
        {
            "children": [
                {
                    "children": [
                        {
                            "children": [
                                {
                                    "children": [],
                                    "line": {
                                        "o": "Country_5",
                                        "oType": "https://data.mydomain.com/ontologies/sparnatural-config/Country",
                                        "p": "https://data.mydomain.com/ontologies/sparnatural-config/Person_bornIn",
                                        "s": "Person_3",
                                        "sType": "https://data.mydomain.com/ontologies/sparnatural-config/Person",
                                        "values": [
                                            {
                                                "label": "Italy",
                                                "rdfTerm": {
                                                    "type": "uri",
                                                    "value": "http://dbpedia.org/resource/Italy"
                                                }
                                            }
                                        ]
                                    }
                                }
                            ],
                            "line": {
                                "o": "Person_3",
                                "oType": "https://data.mydomain.com/ontologies/sparnatural-config/Person",
                                "p": "https://data.mydomain.com/ontologies/sparnatural-config/Artwork_author",
                                "s": "Artwork_2",
                                "sType": "https://data.mydomain.com/ontologies/sparnatural-config/Artwork",
                                "values": []
                            }
                        }
                    ],
                    "line": {
                        "o": "Artwork_2",
                        "oType": "https://data.mydomain.com/ontologies/sparnatural-config/Artwork",
                        "p": "https://data.mydomain.com/ontologies/sparnatural-config/Museum_displays",
                        "s": "Museum_1",
                        "sType": "https://data.mydomain.com/ontologies/sparnatural-config/Museum",
                        "values": []
                    }
                }
            ],
            "line": {
                "o": "Country_4",
                "oType": "https://data.mydomain.com/ontologies/sparnatural-config/Country",
                "p": "https://data.mydomain.com/ontologies/sparnatural-config/Museum_country",
                "s": "Museum_1",
                "sType": "https://data.mydomain.com/ontologies/sparnatural-config/Museum",
                "values": [
                    {
                        "label": "France",
                        "rdfTerm": {
                            "type": "uri",
                            "value": "http://dbpedia.org/resource/France"
                        }
                    }
                ]
            }
        }
    ],
    "distinct": true,
    "order": null,
    "variables": [
        {
            "termType": "Variable",
            "value": "Museum_1"
        },
        {
            "termType": "Variable",
            "value": "Artwork_2"
        },
        {
            "termType": "Variable",
            "value": "Person_3"
        }
    ]
}

[BouzelatTarek]

Query: "Œuvres baroq"
parsed:

{
      "distinct": true,
      "variables": [
        {
          "termType": "Variable",
          "value": "Artwork_1"
        }
      ],
      "order": null,
      "branches": [
        {
          "line": {
            "s": "Artwork_1",
            "p": "https://data.mydomain.com/ontologies/sparnatural-config/Artwork_description",
            "o": "Text_2",
            "sType": "https://data.mydomain.com/ontologies/sparnatural-config/Artwork",
            "oType": "https://data.mydomain.com/ontologies/sparnatural-config/Text",
            "values": [
              {
                "label": "baroq"
              }
            ]
          },
          "children": []
        }
      ],
      "metadata": {
        "explanation": "La recherche porte sur les œuvres dont la description contient le terme 'baroq'. Pour une recherche plus précise sur le mouvement Baroque, il faudrait utiliser la propriété 'movement' de l'artiste associé à l'œuvre."
      }
    }