Update code-sign.yml for Azure Pipelines (#22239)

Author: Nickcandy

.azure-pipelines/code-sign.yml

@@ -20,6 +20,7 @@ jobs:
           git remote set-url origin https://azure-powershell-bot:[email protected]/Azure/azure-powershell.git;
           git fetch origin
           git checkout -b ${{ parameters.OOBBranch }} origin/${{ parameters.OOBBranch }}
+    condition: and(succeeded(), ne('${{ parameters.OOBBranch }}', 'none'))
   - pwsh: 'Install-Module platyPS -Force -Confirm:$false -Scope CurrentUser'
     displayName: 'Install platyPS'