(aws-ec2): Empty content InitFile fails in CloudFormation

[mina-asham]

This is not really a bug I would say but more of a missing validation, I tried to create a marker file with CfnInit:

InitFile.fromString(fileName, "");

But when cfn-init ran on the host I got:

2021-02-12 09:19:52,491 [ERROR] Error encountered during build of REDACTED_CONFIG_NAME: File specified without source or content

It looks like this is not allowed in CloudFormation (not ideal but fine), so we should add some validation for the InitFile on the content (I realize this is might not possible for ALL types, e.g. S3, but still worth it for simple ones)

Reproduction Steps

Trying to add an empty InitFile using any way

What did you expect to happen?

Getting a failure during synth instead of waiting till I actually deploy.

What actually happened?

Environment

• CDK CLI Version : 1.88.0
• Framework Version: 1.88.0
• Node.js Version: Irrelevant
• OS : Irrelevant
• Language (Version): Irrelevant

Other

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This is 🐛 Bug Report

[github-actions]

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