Allow Save-package-properties to exit 0 when prs produce no package changes (#23369)

Co-authored-by: Patrick Hallisey <pahallis@microsoft.com>

eng/common/scripts/Save-Package-Properties.ps1

@@ -99,56 +99,63 @@ $exportedPaths = @{}
 $allPackageProperties = @()
 
 if ($prDiff) {
+  Write-Host "Getting package properties for PR diff file: $prDiff"
   $allPackageProperties = Get-PrPkgProperties $prDiff
+
+  if (!$allPackageProperties) {
+    Write-Host "No packages found matching PR diff file $prDiff"
+    Write-Host "Setting NoPackagesChanged variable to true"
+    Write-Host "##vso[task.setvariable variable=NoPackagesChanged]true"
+    exit 0
+  }
 }
 else {
+  Write-Host "Getting package properties for service directory: $serviceDirectory"
   $allPackageProperties = Get-AllPkgProperties $serviceDirectory
-}
 
-if ($allPackageProperties)
-{
-    if (-not (Test-Path -Path $outDirectory))
-    {
-      New-Item -ItemType Directory -Force -Path $outDirectory
-    }
-    foreach($pkg in $allPackageProperties)
-    {
-        if ($pkg.Name) {
-          Write-Host "Package Name: $($pkg.Name)"
-          Write-Host "Package Version: $($pkg.Version)"
-          Write-Host "Package SDK Type: $($pkg.SdkType)"
-          Write-Host "Artifact Name: $($pkg.ArtifactName)"
-          Write-Host "Release date: $($pkg.ReleaseStatus)"
-          $configFilePrefix = $pkg.Name
-          if ($pkg.ArtifactName)
-          {
-            $configFilePrefix = $pkg.ArtifactName
-          }
-          $outputPath = Join-Path -Path $outDirectory "$configFilePrefix.json"
-          Write-Host "Output path of json file: $outputPath"
-          $outDir = Split-Path $outputPath -parent
-          if (-not (Test-Path -path $outDir))
-          {
-            Write-Host "Creating directory $($outDir) for json property file"
-            New-Item -ItemType Directory -Path $outDir
-          }
-
-          # If package properties for a track 2 (IsNewSdk = true) package has
-          # already been written, skip writing to that same path.
-          if ($exportedPaths.ContainsKey($outputPath) -and $exportedPaths[$outputPath].IsNewSdk -eq $true) {
-            Write-Host "Track 2 package info with file name $($outputPath) already exported. Skipping export."
-            continue
-          }
-          $exportedPaths[$outputPath] = $pkg
-
-          SetOutput $outputPath $pkg
-        }
-    }
-
-    Get-ChildItem -Path $outDirectory
-}
-else
-{
-    Write-Error "Package properties are not available for service directory $serviceDirectory or $prdiff"
+  if (!$allPackageProperties) {
+    Write-Error "Package properties are not available for service directory $serviceDirectory"
     exit 1
+  }
 }
+
+if (-not (Test-Path -Path $outDirectory))
+{
+  New-Item -ItemType Directory -Force -Path $outDirectory | Out-Null
+}
+
+foreach($pkg in $allPackageProperties)
+{
+  if ($pkg.Name) {
+    Write-Host "Package Name: $($pkg.Name)"
+    Write-Host "Package Version: $($pkg.Version)"
+    Write-Host "Package SDK Type: $($pkg.SdkType)"
+    Write-Host "Artifact Name: $($pkg.ArtifactName)"
+    Write-Host "Release date: $($pkg.ReleaseStatus)"
+    $configFilePrefix = $pkg.Name
+    if ($pkg.ArtifactName)
+    {
+      $configFilePrefix = $pkg.ArtifactName
+    }
+    $outputPath = Join-Path -Path $outDirectory "$configFilePrefix.json"
+    Write-Host "Output path of json file: $outputPath"
+    $outDir = Split-Path $outputPath -parent
+    if (-not (Test-Path -path $outDir))
+    {
+      Write-Host "Creating directory $($outDir) for json property file"
+      New-Item -ItemType Directory -Path $outDir | Out-Null
+    }
+
+    # If package properties for a track 2 (IsNewSdk = true) package has
+    # already been written, skip writing to that same path.
+    if ($exportedPaths.ContainsKey($outputPath) -and $exportedPaths[$outputPath].IsNewSdk -eq $true) {
+      Write-Host "Track 2 package info with file name $($outputPath) already exported. Skipping export."
+      continue
+    }
+    $exportedPaths[$outputPath] = $pkg
+
+    SetOutput $outputPath $pkg
+  }
+}
+
+Get-ChildItem -Path $outDirectory