Entity Relationship Model results in Parsing Error

```
@startchen

entity Person {
}

@endchen
```
results in:
```
{"duration":241,"status":"Parsing error","line":1,"error":"Syntax Error?"}
```

see perma-link
https://plantuml.github.io/plantuml-core/raw.html?SoWkIImgISv8pUFYIiqhoIofL0X8BIhEprEevghbud98pKi1IG80