fix(core): Check all node outputs when using "Always Output Data" before adding an empty object

[RomanDavydchuk]

Summary

Fix a bug where the node with multiple outputs returns an empty object in the first output when "Always Output Data" is true, even if other outputs have data

Workflow to test:

{
  "name": "Always Output Data with Multiple Outputs",
  "nodes": [
    {
      "parameters": {},
      "type": "n8n-nodes-base.manualTrigger",
      "typeVersion": 1,
      "position": [
        0,
        96
      ],
      "id": "ab24ff83-386c-4508-9766-b296ac2fe0f1",
      "name": "When clicking ‘Execute workflow’"
    },
    {
      "parameters": {
        "conditions": {
          "options": {
            "caseSensitive": true,
            "leftValue": "",
            "typeValidation": "strict",
            "version": 2
          },
          "conditions": [
            {
              "id": "f950b942-88db-4149-8186-c657d4a646b2",
              "leftValue": false,
              "rightValue": "",
              "operator": {
                "type": "boolean",
                "operation": "true",
                "singleValue": true
              }
            }
          ],
          "combinator": "and"
        },
        "options": {}
      },
      "type": "n8n-nodes-base.if",
      "typeVersion": 2.2,
      "position": [
        224,
        0
      ],
      "id": "894869a3-7380-4728-9676-d998cb57f474",
      "name": "Always Output Data == true",
      "alwaysOutputData": true
    },
    {
      "parameters": {
        "conditions": {
          "options": {
            "caseSensitive": true,
            "leftValue": "",
            "typeValidation": "strict",
            "version": 2
          },
          "conditions": [
            {
              "id": "f950b942-88db-4149-8186-c657d4a646b2",
              "leftValue": false,
              "rightValue": "",
              "operator": {
                "type": "boolean",
                "operation": "true",
                "singleValue": true
              }
            }
          ],
          "combinator": "and"
        },
        "options": {}
      },
      "type": "n8n-nodes-base.if",
      "typeVersion": 2.2,
      "position": [
        224,
        192
      ],
      "id": "2e2ac3d6-6694-4b44-997f-032de4af20f7",
      "name": "Always Output Data == false"
    }
  ],
  "pinData": {
    "When clicking ‘Execute workflow’": [
      {
        "json": {
          "foo": "bar"
        }
      }
    ]
  },
  "connections": {
    "When clicking ‘Execute workflow’": {
      "main": [
        [
          {
            "node": "Always Output Data == true",
            "type": "main",
            "index": 0
          },
          {
            "node": "Always Output Data == false",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  },
  "active": false,
  "settings": {
    "executionOrder": "v1"
  },
  "versionId": "2d0af639-3014-4491-afd3-ee81d1c1bcd9",
  "meta": {
    "instanceId": "eeda9e3069aca300d1dfceeb64beb5b53d715db44a50461bbc5cb0cf6daa01e3"
  },
  "id": "25lWZUaSQnoiwP7h",
  "tags": []
}

Related Linear tickets, Github issues, and Community forum posts

https://linear.app/n8n/issue/NODE-3296/community-issue-switch-node-bug-correct-eval-wrong-conclusion
Closes #14334

Review / Merge checklist

• PR title and summary are descriptive. (conventions)
• Docs updated or follow-up ticket created.
• Tests included.
• PR Labeled with release/backport (if the PR is an urgent fix that needs to be backported)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[cubic-dev-ai]

cubic analysis

No issues found across 3 files. Review in cubic

[ShireenMissi]

Tested locally and it works as expected 🎉

[currents-bot]

✅

E2E Tests: n8n tests passed after 5m 19.8s

🟢 514 · 🔴 0 · ⚪️ 0

View Run Details

Run Details

• Project: n8n

• Groups: 3

• Framework: Playwright

• Run Status: Passed

• Commit: ee7597f

• Spec files: 107

• Overall tests: 514

• Duration: 5m 19.8s

• Parallelization: 3

Groups

GroupId	Results	Spec Files Progress
ui	🟢 39 · 🔴 0 · ⚪️ 0	13 / 13
ui:isolated	🟢 6 · 🔴 0 · ⚪️ 0	2 / 2
No name	🟢 469 · 🔴 0 · ⚪️ 0	92 / 92

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[janober]

Got released with n8n@1.108.0