Fpm/error handling

[FrederikPM]

• Fixed errors so they can be cachted by the error node.
• Added clean up of the python process when the node is closed/disabled.
• Use the exit event instead of close event for the python process to detect if it was killed or not.

Test flow:

[    {        "id": "25441caf3c8534e2",        "type": "venv",        "z": "7a7ae303f662be9f",        "venvconfig": "4657b6fbdbaf6f7e",        "name": "venv test",        "code": "# Import the time library\nimport time\nstart = time.time()\n\noffset = msg[\"payload\"] if \"payload\" in msg else 0\n\ntime.sleep(1)\nend = time.time()\nlength = end - start\nprint(f'Time: {length}')\n\nwhile True:\n    time.sleep(1)\n    end = time.time()\n    length = end - start\n    if length > 2:\n        raise Exception(\"EXCEPTION!\") \n    print(f'Time: {length + offset}')",        "continuous": true,        "stdInData": false,        "x": 380,        "y": 180,        "wires": [            [                "114b918e3eb7ad96"            ]        ]    },    {        "id": "446c4d54c3afdb80",        "type": "inject",        "z": "7a7ae303f662be9f",        "name": "",        "props": [            {                "p": "payload"            }        ],        "repeat": "",        "crontab": "",        "once": false,        "onceDelay": 0.1,        "topic": "",        "payload": "5",        "payloadType": "num",        "x": 110,        "y": 220,        "wires": [            [                "25441caf3c8534e2"            ]        ]    },    {        "id": "5056f4320a8479d0",        "type": "inject",        "z": "7a7ae303f662be9f",        "name": "terminate",        "props": [            {                "p": "terminate",                "v": "true",                "vt": "bool"            }        ],        "repeat": "",        "crontab": "",        "once": false,        "onceDelay": 0.1,        "topic": "",        "x": 120,        "y": 140,        "wires": [            [                "25441caf3c8534e2"            ]        ]    },    {        "id": "114b918e3eb7ad96",        "type": "debug",        "z": "7a7ae303f662be9f",        "name": "debug 1",        "active": true,        "tosidebar": true,        "console": false,        "tostatus": false,        "complete": "payload",        "targetType": "msg",        "statusVal": "",        "statusType": "auto",        "x": 640,        "y": 180,        "wires": []    },    {        "id": "89aac1fd133f1b5b",        "type": "catch",        "z": "7a7ae303f662be9f",        "name": "",        "scope": null,        "uncaught": false,        "x": 540,        "y": 300,        "wires": [            [                "73882114753d4bc1"            ]        ]    },    {        "id": "73882114753d4bc1",        "type": "debug",        "z": "7a7ae303f662be9f",        "name": "debug 98",        "active": true,        "tosidebar": true,        "console": false,        "tostatus": false,        "complete": "true",        "targetType": "full",        "statusVal": "",        "statusType": "auto",        "x": 740,        "y": 280,        "wires": []    },    {        "id": "4657b6fbdbaf6f7e",        "type": "venv-config",        "venvname": "pyenv",        "version": "default"    }]

[404background]

Thank you @FrederikPM !

I tested the flow. Before the change, the program could not catch errors at the error node.

After the change, the error could be caught at the error node.

It worked fine, so I merge this Pull Request.