Passing an empty token or webhook url does not cause an error

[koki-develop]

Description

If SLACK_BOT_TOKEN or SLACK_WEBHOOK_URL is set to an empty string, the action will succeed. Is this intentional?

What type of issue is this? (place an x in one of the [ ])

• [x] bug
• [ ] enhancement (feature request)
• [ ] question
• [ ] documentation related
• [ ] example code related
• [ ] testing related
• [ ] discussion

Requirements (place an x in each of the [ ])

• [x] I've read and understood the Contributing guidelines and have done my best effort to follow them.
• [x] I've read and agree to the Code of Conduct.
• [x] I've searched for any related issues and avoided creating a duplicate issue.

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Bug Report

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Reproducible in:

package version: v1.21.0

node version:

OS version(s): ubuntu-22.04

Steps to reproduce:

1. Set SLACK_BOT_TOKEN or SLACK_WEBHOOK_URL to an empty string
2. Run workflow

Expected result:

Expect the action to fail.

Actual result:

The action will succeed. Naturally, no message is sent.

Attachments:

Debugged in this repository: https://github.com/koki-develop/slack-github-action-debug

You can see that the action is not failing even though SLACK_BOT_TOKEN and SLACK_WEBHOOK_URL are set to empty characters or nonexistent secret.

Log: https://github.com/koki-develop/slack-github-action-debug/actions/runs/2991645944

      - uses: slackapi/[email protected]
        env:
          SLACK_WEBHOOK_URL: ""
      - uses: slackapi/[email protected]
        env:
          SLACK_WEBHOOK_URL: ${{ secrets.NON_EXSISTENT_SECRET }}

https://github.com/koki-develop/slack-github-action-debug/blob/2fac0fd12078736e04359578a64b6e760faf86a6/.github/workflows/main.yml#L10-L15