fix(repository:) Add input validation for GetOperation

src/dsc/psresourceget.ps1

@@ -376,6 +376,11 @@ function GetOperation {
         [string]$ResourceType
     )
 
+    if ([string]::IsNullOrEmpty($stdinput)) {
+        Write-Trace -level error -message "Get operation requires --input with the resource properties. No input was provided."
+        exit [ExitCode]::Error
+    }
+
     $inputObj = $stdinput | ConvertFrom-Json -ErrorAction Stop
 
     Write-Trace -message "Starting Get operation for ResourceType: $ResourceType" -level trace

test/DscResource/PSResourceGetDSCResource.Tests.ps1

@@ -142,6 +142,12 @@ Describe 'Repository Resource Tests' -Tags 'CI' {
         }
     }
 
+    It 'Get operation without --input exits with a non-zero code and does not produce an unhandled exception' {
+        $output = & $script:dscExe resource get --resource Microsoft.PowerShell.PSResourceGet/Repository -o json 2>&1
+        $LASTEXITCODE | Should -Not -Be 0
+        ($output | Out-String) | Should -Not -Match 'Cannot bind argument to parameter'
+    }
+
     It 'Can delete a Repository resource instance' {
         # First, create a repository to delete
         Register-PSResourceRepository -Name 'TestRepoToDelete' -uri 'https://www.doesnotexist.com' -ErrorAction SilentlyContinue -APIVersion Local