title: Exported Azure Resource Group Template has null parameters
body: <p>Trying to recreate a resource group from template I previously exported but getting this error :</p>
  
  <p><code>The value of deployment parameter 'Redis_polyrediscachegraphicsxp_name' is null. Please specify the value or use the parameter reference.</code></p>
  
  <p>Indeed the parameters.json file has null values :</p>
  
  <pre><code> "parameters": {
      "Redis_polyrediscachegraphicsxp_name": {
          "value": null
      },
      "storageAccounts_polystorgraphicsxp_name": {
          "value": null
      },
      "databaseAccounts_polycosmosgraphicsxp_name": {
          "value": null
      }
  }
  </code></pre>
  
  <p>How can this be fixed ?</p>