Page with empty layout should go to default

The following is an example of the kind of metadata page should have 

```
{
"title" : "ESUG",
"layout": "defaultESUG",
"publishDate": "2021-02-01"
}

```

when there is no layout (as below) the system seems to break. We should support a default, such as default. 

{
"title" : "ESUG",
"publishDate": "2021-02-01"
}