Use empty string as label-prefix input

[nyjr10025]

What happened

Trying to use the action with no prefix. I want to use the simple labels of patch, minor, and major instead of prefixing them with release/ on my PR's.

The action ran without issue but output no level after putting an empty string for label_prefix instead of using the release/ default prefix. The debug logs showed no release label after running.

What you expected to happen

the action to output a level associated with one of the follow PR tags: patch, minor, and major as inputs

How to reproduce it

name: Test Repro

on:
  pull_request:
    types:
      - closed
    branches: 
      - 'main'

jobs:
  build:
    if: github.event.pull_request.merged == true
    runs-on: ubuntu-latest
    steps:
      - uses: actions-ecosystem/action-get-merged-pull-request@v1
        id: get-merged-pull-request
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}

      - uses: actions-ecosystem/action-release-label@v1
        id: release-label
        if: ${{ steps.get-merged-pull-request.outputs.title != null }}
        with:
          label_prefix: ""
          labels: ${{ steps.get-merged-pull-request.outputs.labels }}

      - uses: actions-ecosystem/action-get-latest-tag@v1
        id: get-latest-tag
        if: ${{ steps.release-label.outputs.level != null }}
        with:
          semver_only: true
...

The last step will be skipped since steps.release-label.outputs.level == null

Environment

Not sure what is meant here. As in like what environment in GitHub Actions?