With the following serverless.yml file:
```yml
service: localtest

provider:
  name: aws
  runtime: nodejs10.x

functions:
  hello:
    handler: handler.hello
    events:
    - stream:
        type: dynamodb
        arn:
          Fn::GetAtt: [fooTable, StreamArn]

resources:
  Resources:
    fooTable:
      Type: AWS::DynamoDB::Table
      Properties:
        TableName: fooTable
        AttributeDefinitions:
          - AttributeName: foo
            AttributeType: S
        KeySchema:
          - AttributeName: foo
            KeyType: HASH
        ProvisionedThroughput:
          ReadCapacityUnits: 1
          WriteCapacityUnits: 1
        StreamSpecification:
          StreamViewType: NEW_AND_OLD_IMAGES

plugins:
- "serverless-localstack"

custom:
  localstack:
    stages:
      - "local"
```
It fails with a generic error (500) on the deployment end and with `:ERROR:localstack.services.cloudformation.cloudformation_starter: Unable to parse and create resource "HelloEventSourceMappingDynamodbFooTable": 'NoneType' object has no attribute 'function_arn'` on the localstack end.
It deploys fine to AWS.
""" A context manager that captures stdout/stderr of the current thread. Use it as follows:
        with CaptureOutput() as c:
            ...
        print(c.stdout(), c.stderr())
    """
    orig_stdout = sys.stdout
    orig_stderr = sys.stderr
    orig___stdout = sys.__stdout__
    orig___stderr = sys.__stderr__
    CONTEXTS_BY_THREAD = {}
    class LogStreamIO(io.StringIO):
        def write(self, s):
            if isinstance(s, str) and hasattr(s, 'decode'):
                s = s.decode('unicode-escape')
            return super(CaptureOutput.LogStreamIO, self).write(s)
    def __init__(self):