Prerna

According to documentation for [AWS::Config::ConfigurationAggregator](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-config-configurationaggregator.html), specifically the data structure [AccountAggregationSource](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-config-configurationaggregator-accountaggregationsource.html) mentions that `AllAwsRegions` and `AwsRegions` are optional properties. Why does the following template still fail? ``` Description: "This template creates...

cfn validate does not show a clear message to fix the schema

3

I ran `cfn validate` against a [resource schema](https://github.com/aws-cloudformation/aws-cloudformation-resource-providers-redshift/blob/master/clustersubnetgroup/aws-redshift-clustersubnetgroup.json) with issues that should be caught by [this fix](https://github.com/aws-cloudformation/cloudformation-cli/pull/642). But the message is confusing. The message should be clear in what has...