Using partials in a list content page causes error

[Aintaer]

Using an index.json:

{
  "content" : {
    "list" : "post",
    "limit" : 1
  },
  "partials" : {
    "navigation" : "navigation"
  }
}

Causes blacksmith to error out at:

node_modules\blacksmith\lib\blacksmith\page.js:158
          metadata:   source._content.metadata,
                                     ^
TypeError: Cannot read property 'metadata' of undefined

AFAIK, this happens due to blacksmith attempting to render the partials with metadata where none exists due to the page being entirely generated from posts, hence having no metadata of its own.