Fix powershell client Build.ps1 and *.psm1 error when there is a missing Model folder (#17025)

* fix(powershell): make sure paths exists when building and importing module

* chore(powershell): update sample psm1 and build.ps1 with path check

Author: elonmallin

modules/openapi-generator/src/main/resources/powershell/Build.ps1.mustache

@@ -39,7 +39,9 @@ function Get-FunctionsToExport {
 }
 
 $ScriptDir = Split-Path $script:MyInvocation.MyCommand.Path
-$FunctionPath = 'Api', 'Model', 'Client' | ForEach-Object {Join-Path "$ScriptDir\src\{{{packageName}}}\" $_}
+$FunctionPath = 'Api', 'Model', 'Client' | Where-Object {
+    Join-Path "$ScriptDir\src\{{{packageName}}}\" $_ | Test-Path
+} | ForEach-Object { Join-Path "$ScriptDir\src\{{{packageName}}}\" $_ }
 
 $Manifest = @{
     Path = "$ScriptDir\src\{{{packageName}}}\{{{packageName}}}.psd1"

modules/openapi-generator/src/main/resources/powershell/Org.OpenAPITools.psm1.mustache

@@ -17,7 +17,9 @@ $Script:Configuration = [System.Collections.HashTable]@{}
 
 $Script:CmdletBindingParameters = @('Verbose','Debug','ErrorAction','WarningAction','InformationAction','ErrorVariable','WarningVariable','InformationVariable','OutVariable','OutBuffer','PipelineVariable')
 
-'Api', 'Model', 'Client', 'Private' | Get-ChildItem -Path {
+'Api', 'Model', 'Client', 'Private' | Where-Object {
+    Join-Path $PSScriptRoot $_ | Test-Path
+} | Get-ChildItem -Path {
     Join-Path $PSScriptRoot $_
 } -Filter '*.ps1' | ForEach-Object {
     Write-Debug "Importing file: $($_.BaseName)"

samples/client/petstore/powershell/Build.ps1

@@ -45,7 +45,9 @@ function Get-FunctionsToExport {
 }
 
 $ScriptDir = Split-Path $script:MyInvocation.MyCommand.Path
-$FunctionPath = 'Api', 'Model', 'Client' | ForEach-Object {Join-Path "$ScriptDir\src\PSPetstore\" $_}
+$FunctionPath = 'Api', 'Model', 'Client' | Where-Object {
+    Join-Path "$ScriptDir\src\PSPetstore\" $_ | Test-Path
+} | ForEach-Object { Join-Path "$ScriptDir\src\PSPetstore\" $_ }
 
 $Manifest = @{
     Path = "$ScriptDir\src\PSPetstore\PSPetstore.psd1"

samples/client/petstore/powershell/src/PSPetstore/PSPetstore.psm1

@@ -23,7 +23,9 @@ $Script:Configuration = [System.Collections.HashTable]@{}
 
 $Script:CmdletBindingParameters = @('Verbose','Debug','ErrorAction','WarningAction','InformationAction','ErrorVariable','WarningVariable','InformationVariable','OutVariable','OutBuffer','PipelineVariable')
 
-'Api', 'Model', 'Client', 'Private' | Get-ChildItem -Path {
+'Api', 'Model', 'Client', 'Private' | Where-Object {
+    Join-Path $PSScriptRoot $_ | Test-Path
+} | Get-ChildItem -Path {
     Join-Path $PSScriptRoot $_
 } -Filter '*.ps1' | ForEach-Object {
     Write-Debug "Importing file: $($_.BaseName)"