npm additional tag whitespace check (#29463)

bug fix: npm publishing with additional tag runs even with no additional
tags being specified

eng/pipelines/templates/steps/npm-release-task.yml

@@ -8,7 +8,7 @@ parameters:
 
 steps:
   - template: /eng/common/pipelines/templates/steps/set-default-branch.yml
-  - ${{if eq(parameters.Registry, 'https://registry.npmjs.org/')}}:
+  - ${{ if eq(parameters.Registry, 'https://registry.npmjs.org/') }}:
       - task: EsrpRelease@6
         inputs:
           displayName: 'Publish ${{parameters.Artifact.name}} to ESRP'
@@ -22,16 +22,14 @@ steps:
           MainPublisher: 'ESRPRELPACMANTEST'
           DomainTenantId: '72f988bf-86f1-41af-91ab-2d7cd011db47'
           ProductStateField: ${{parameters.Tag}}
-
-      - ${{if ne(parameters.AdditionalTag, '')}}:
-        - task: PowerShell@2
-          displayName: Add Additional Tag
-          inputs:
-            targetType: filePath
-            filePath: eng/tools/publish-to-npm.ps1
-            arguments: -addTag $true -pathToArtifacts ${{parameters.PathToArtifacts}} -accessLevel "public" -tag "${{parameters.AdditionalTag}}" -registry ${{parameters.Registry}} -npmToken $(azure-sdk-npm-token)
-            pwsh: true
-          condition: succeeded()
+      - task: PowerShell@2
+        displayName: Add Additional Tag
+        inputs:
+          targetType: filePath
+          filePath: eng/tools/publish-to-npm.ps1
+          arguments: -addTag $true -pathToArtifacts ${{parameters.PathToArtifacts}} -accessLevel "public" -tag "${{parameters.AdditionalTag}}" -registry ${{parameters.Registry}} -npmToken $(azure-sdk-npm-token)
+          pwsh: true
+        condition: succeeded()
 
   - ${{ else }}:
       - task: PowerShell@2

eng/tools/publish-to-npm.ps1

@@ -167,7 +167,9 @@ try {
                 Write-Host "npm dist-tag add $nameAndVersion $tag"
                 npm dist-tag add $nameAndVersion $tag
             }
-            if ($additionalTag -ne "" && $additionalTag -ne $tag) {
+            if (![string]::IsNullOrWhitespace($additionalTag) -and ($additionalTag -ne $tag)) {
+                Write-Host "Tag: '$tag'"
+                Write-Host "Additional tag: '$additionalTag'"
                 Write-Host "Adding additional tag for package"
                 Write-Host "npm dist-tag add $nameAndVersion $additionalTag"
                 npm dist-tag add $nameAndVersion $additionalTag