Error loading staged page

**What Happened?**
I attempted to stage my project docs by navigating to: https://firebaseopensource.com/stageProject?org=anishkny&repo=integrify&branch=firebaseopensource

In response I got the staged docs URL: https://firebaseopensource.com/projects-staging/anishkny/integrify

When I load the second URL, empty page shows up with errors in console:

```
index.6faf844060ccecfc5191.js:2 project:asyncData(/projects-staging/anishkny/integrify)
index.6faf844060ccecfc5191.js:2 load(anishkny, integrify, undefined, staging)
index.6faf844060ccecfc5191.js:2 [2019-05-12T14:05:12.762Z] @firebase/firestore: Firestore (5.8.1):
The timestampsInSnapshots setting now defaults to true and you no
longer need to explicitly set it. In a future release, the setting
will be removed entirely and so it is recommended that you remove it
from your firestore.settings() call now.
a @ index.6faf844060ccecfc5191.js:2
t.error @ index.6faf844060ccecfc5191.js:2
d @ index.6faf844060ccecfc5191.js:2
t @ index.6faf844060ccecfc5191.js:2
t.settings @ index.6faf844060ccecfc5191.js:2
(anonymous) @ index.6faf844060ccecfc5191.js:2
(anonymous) @ index.6faf844060ccecfc5191.js:2
i @ index.6faf844060ccecfc5191.js:2
GetInstance @ index.6faf844060ccecfc5191.js:2
(anonymous) @ index.6faf844060ccecfc5191.js:2
(anonymous) @ index.6faf844060ccecfc5191.js:2
f @ index.6faf844060ccecfc5191.js:2
load @ index.6faf844060ccecfc5191.js:2
(anonymous) @ index.6faf844060ccecfc5191.js:2
(anonymous) @ index.6faf844060ccecfc5191.js:2
o @ index.6faf844060ccecfc5191.js:2
asyncData @ index.6faf844060ccecfc5191.js:2
$ @ app.264e50f677700b50b09c.js:1
(anonymous) @ app.264e50f677700b50b09c.js:1
(anonymous) @ app.264e50f677700b50b09c.js:1
w @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
t. @ vendor.44aaf9db51131fb77291.js:2
o @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
Promise.then (async)
o @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
Promise.then (async)
o @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
Promise.then (async)
o @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
Promise.then (async)
o @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
e @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ app.264e50f677700b50b09c.js:1
(anonymous) @ app.264e50f677700b50b09c.js:1
w @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
t. @ vendor.44aaf9db51131fb77291.js:2
o @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
Promise.then (async)
o @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
Promise.then (async)
o @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
e @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ app.264e50f677700b50b09c.js:1
Promise.then (async)
T23V @ app.264e50f677700b50b09c.js:1
o @ manifest.73c25c24a59201f44bd1.js:1
window.webpackJsonp @ manifest.73c25c24a59201f44bd1.js:1
(anonymous) @ app.264e50f677700b50b09c.js:1
vendor.44aaf9db51131fb77291.js:2 TypeError: Cannot read property 'parentNode' of undefined
at Object.parentNode (vendor.44aaf9db51131fb77291.js:2)
at a.__patch__ (vendor.44aaf9db51131fb77291.js:2)
at a.t._update (vendor.44aaf9db51131fb77291.js:2)
at a.n (vendor.44aaf9db51131fb77291.js:2)
at Me.get (vendor.44aaf9db51131fb77291.js:2)
at Me.run (vendor.44aaf9db51131fb77291.js:2)
at Te (vendor.44aaf9db51131fb77291.js:2)
at Array. (vendor.44aaf9db51131fb77291.js:2)
at Wt (vendor.44aaf9db51131fb77291.js:2)
zt @ vendor.44aaf9db51131fb77291.js:2
Kt @ vendor.44aaf9db51131fb77291.js:2
qt @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
Wt @ vendor.44aaf9db51131fb77291.js:2
Promise.then (async)
Vt @ vendor.44aaf9db51131fb77291.js:2
te @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
Me.update @ vendor.44aaf9db51131fb77291.js:2
ut.notify @ vendor.44aaf9db51131fb77291.js:2
set @ vendor.44aaf9db51131fb77291.js:2
error @ app.264e50f677700b50b09c.js:1
(anonymous) @ app.264e50f677700b50b09c.js:1
w @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
t. @ vendor.44aaf9db51131fb77291.js:2
o @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
Promise.then (async)
o @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
Promise.then (async)
o @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
Promise.then (async)
o @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
Promise.then (async)
o @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
Promise.then (async)
o @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
Promise.then (async)
o @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
e @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ app.264e50f677700b50b09c.js:1
(anonymous) @ app.264e50f677700b50b09c.js:1
w @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
t. @ vendor.44aaf9db51131fb77291.js:2
o @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
Promise.then (async)
o @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
Promise.then (async)
o @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
e @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ vendor.44aaf9db51131fb77291.js:2
(anonymous) @ app.264e50f677700b50b09c.js:1
Promise.then (async)
T23V @ app.264e50f677700b50b09c.js:1
o @ manifest.73c25c24a59201f44bd1.js:1
window.webpackJsonp @ manifest.73c25c24a59201f44bd1.js:1
(anonymous) @ app.264e50f677700b50b09c.js:1
```

**What Did You Expect to Happen**
Staged docs should render at https://firebaseopensource.com/projects-staging/anishkny/integrify

**Screenshot (If Applicable)**

Reproduce el fallo preparando un proyecto de ejemplo en la URL de stageProject; después, carga su URL de projects-staging e inspecciona la consola del navegador. Parte de la ruta asyncData/load indicada y del TypeError relacionado con parentNode; se considera terminado cuando la documentación preparada se renderiza en lugar de mostrar una página vacía.

Escrito por el modelo de indexación a partir del texto del issue.