Error when modify team

## Problem Description
When I added team to project I get 500 error in webhook.

### What is actually happening

All web hooks that have team payload either adding team to project or updating team.

### What is the expected behavior

success response 200.

### Error output, if available

```
AggregateError:
TypeError: Cannot read properties of undefined (reading 'data')
at ConfigManager.loadYaml (/opt/safe-settings/lib/configManager.js:28:34)
at async syncSettings (/opt/safe-settings/index.js:71:29)
at async Promise.all (index 0)
at async middleware (/opt/safe-settings/node_modules/@octokit/webhooks/dist-node/index.js:355:5)
```

## Context

### Are you using the hosted instance of probot/settings or running your own?

Yes on ec2 with Docker compose.

### If running your own instance, are you using it with github.com or GitHub Enterprise?
github.com

#### Version of probot/settings

Deployed `master-enterprise` branch