Update Weekly OpenAPI Download AzDo Pipeline (#848)

Author: peombwa

.azure-pipelines/generation-templates/generate-command-metadata-template.yml

@@ -1,6 +1,7 @@
 # Copyright (c) Microsoft Corporation. All rights reserved.
 # Licensed under the MIT License.
 
+steps:
 - task: PowerShell@2
   displayName: Generate command metadata
   inputs:

.azure-pipelines/generation-templates/generate-service-modules.yml

@@ -4,6 +4,7 @@
 parameters:
   - name: ModulesToGenerate
     type: string
+    default: ""
   - name: AuthModulePath
     type: string
   - name: ServiceModulePath