include empty tags in frontmatter when labels are not present

Author: bryanbcook

src/public/Get-BloggerPost.ps1

@@ -115,7 +115,11 @@ Function Get-BloggerPost {
           $title = $result.title
           $frontMatter = [ordered]@{
             postId = $result.id
-            tags = $result.labels
+          }
+          if ($result['labels']) {
+            $frontMatter['tags'] = $result.labels
+          } else {
+            $frontMatter['tags'] = @()
           }
           $file = "$title.md"
           $filePath = Join-Path -Path $OutDirectory -ChildPath $file

src/tests/Get-BloggerPost.Tests.ps1

@@ -221,6 +221,33 @@ Describe "Get-BloggerPost" {
       $frontMatter.tags[0] | Should -Be "Azure DevOps"
       $frontMatter.tags[1] | Should -Be "Azure Pipelines"
     }
+
+    It "Should include empty tags in frontmatter if labels are not present" {
+      # arrange
+      InModuleScope PSBlogger {
+        # Mock the session to return a test blog ID
+        $BloggerSession.BlogId = "test-blog-id"
+
+        $postId = "123"
+
+        # mock post retrieval
+        Mock Invoke-GApi {
+          return @{ 
+            id = $postId
+            title = "Test Post"
+            published = [datetime]"2023-10-01T17:30:00-04:00"
+            content = "<h1>Hello World</h1><p>This is a post.</p>"
+          }
+        }
+      }
+      # act
+      Get-BloggerPost -PostId $postId -Format Markdown -OutDirectory "TestDrive:\"
+
+      # assert
+      $frontMatter = Get-MarkdownFrontMatter -File $outFile
+      $frontMatter['tags'] -eq $null | Should -BeFalse
+      $frontMatter['tags'] | Should -Be @()
+    }
   }
 
   Context "As Json" {
@@ -292,6 +319,7 @@ Describe "Get-BloggerPost" {
     It "Should write file to specified formatted directory - <dateformat> - <format>" -TestCases @(
       @{ DateFormat = "yyyy\\MM"; ExpectedPath = "TestDrive:\2023\10\Test Post.md"; Format = "Markdown" }
       @{ DateFormat = "yyyy\\MM\\dd"; ExpectedPath = "TestDrive:\2023\10\01\123.html"; Format = "HTML" }
+      @{ DateFormat = "yyyy"; ExpectedPath = "TestDrive:\2023\123.json"; Format = "JSON"}
     ) {
       # arrange
       $invokeArgs = @{