az pipelines create - causes an error on the web ui after creation.

### Extension name (the extension in question)
Pipelines Create
https://docs.microsoft.com/en-us/cli/azure/ext/azure-devops/pipelines?view=azure-cli-latest#ext-azure-devops-az-pipelines-create

### Description of issue (in as much detail as possible)
When creating a build with
``` powershell
az pipelines create --name 'ui-build' --description '' --repository $projectGitUrl --org $baseURL --project $projectId --branch master --yml-path pipeline.yml --skip-run | ConvertFrom-Json
```
The build successfully is created and will run as expected. Trying to edit the build via the webui produces an error.


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