update PS samples

Author: wing328

samples/client/echo_api/powershell/Build.ps1

@@ -46,7 +46,9 @@ function Get-FunctionsToExport {
 }
 
 $ScriptDir = Split-Path $script:MyInvocation.MyCommand.Path
-$FunctionPath = 'Api', 'Model', 'Client' | ForEach-Object {Join-Path "$ScriptDir\src\PSOpenAPITools\" $_}
+$FunctionPath = 'Api', 'Model', 'Client' | Where-Object {
+    Join-Path "$ScriptDir\src\PSOpenAPITools\" $_ | Test-Path
+} | ForEach-Object { Join-Path "$ScriptDir\src\PSOpenAPITools\" $_ }
 
 $Manifest = @{
     Path = "$ScriptDir\src\PSOpenAPITools\PSOpenAPITools.psd1"

samples/client/echo_api/powershell/src/PSOpenAPITools/PSOpenAPITools.psm1

@@ -24,7 +24,9 @@ $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)"