Error in Fn::Join function

[SanderKnape]

Hello. I ran this tool on a CloudFormation template generated by the AWS CDK. I managed to pinpoint the error to the below resource. More specifically, it's the Fn::Join within the ManagedPolicyArns that is causing the error:

{
  "Resources": {
    "CreateFunctionServiceRole58157AB4": {
      "Type": "AWS::IAM::Role",
      "Properties": {
        "AssumeRolePolicyDocument": {
          "Statement": [
            {
              "Action": "sts:AssumeRole",
              "Effect": "Allow",
              "Principal": {
                "Service": "lambda.amazonaws.com"
              }
            }
          ],
          "Version": "2012-10-17"
        },
        "ManagedPolicyArns": [
          {
            "Fn::Join": [
              "",
              [
                "arn:",
                {
                  "Ref": "AWS::Partition"
                },
                ":iam::aws:policy/service-role/AWSLambdaBasicExecutionRole"
              ]
            ]
          }
        ]
      },
      "Metadata": {
        "aws:cdk:path": "CdkStack/CreateFunction/ServiceRole/Resource"
      }
    }
  }
}

I get the following error when generating a diagram for this template:

➜ cfn-dia draw.io -t cdk.out/CdkStack.template.json
(node:20057) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'split' of undefined
    at createPseudoResources (/Users/sander/.nodenv/versions/12.4.0/lib/node_modules/@mhlabs/cfn-diagram/resources/JsonUtil.js:10:37)
    at createPseudoResources (/Users/sander/.nodenv/versions/12.4.0/lib/node_modules/@mhlabs/cfn-diagram/resources/JsonUtil.js:5:7)
    at createPseudoResources (/Users/sander/.nodenv/versions/12.4.0/lib/node_modules/@mhlabs/cfn-diagram/resources/JsonUtil.js:5:7)
    at createPseudoResources (/Users/sander/.nodenv/versions/12.4.0/lib/node_modules/@mhlabs/cfn-diagram/resources/JsonUtil.js:5:7)
    at createPseudoResources (/Users/sander/.nodenv/versions/12.4.0/lib/node_modules/@mhlabs/cfn-diagram/resources/JsonUtil.js:5:7)
    at createPseudoResources (/Users/sander/.nodenv/versions/12.4.0/lib/node_modules/@mhlabs/cfn-diagram/resources/JsonUtil.js:5:7)
    at createPseudoResources (/Users/sander/.nodenv/versions/12.4.0/lib/node_modules/@mhlabs/cfn-diagram/resources/JsonUtil.js:5:7)
    at Object.createPseudoResources (/Users/sander/.nodenv/versions/12.4.0/lib/node_modules/@mhlabs/cfn-diagram/resources/JsonUtil.js:5:7)
    at generate (/Users/sander/.nodenv/versions/12.4.0/lib/node_modules/@mhlabs/cfn-diagram/index.js:89:12)
    at Command.<anonymous> (/Users/sander/.nodenv/versions/12.4.0/lib/node_modules/@mhlabs/cfn-diagram/index.js:44:11)
(node:20057) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 2)
(node:20057) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

[ljacobsson]

Thanks for reporting. A fix is rolling out now