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.
if isinstance(value, dict):
        if len(value) == 1 and 'Ref' in value:
            result = resolve_ref(stack_name, value['Ref'],
                resources, attribute='PhysicalResourceId')
            return result
        elif len(value) == 1 and 'Fn::GetAtt' in value:
            return resolve_ref(stack_name, value['Fn::GetAtt'][0],
                resources, attribute=value['Fn::GetAtt'][1])
        else:
            for key, val in iteritems(value):
                value[key] = resolve_refs_recursively(stack_name, val, resources)
        
        if len(value) == 1 and 'Fn::Join' in value:
            return value['Fn::Join'][0].join(value['Fn::Join'][1])
        if len(value) == 1 and 'Fn::Sub' in value:
            result = value['Fn::Sub'][0]
            for key, val in value['Fn::Sub'][1].items():
                val = resolve_refs_recursively(stack_name, val, resources)
                result = result.replace('${%s}' % key, val)
            return result
    if isinstance(value, list):
        for i in range(0, len(value)):
            value[i] = resolve_refs_recursively(stack_name, value[i], resources)
    return value