Field Guide pages can't be loaded

[crazytonyli]

Expected behavior

The app can displays pages list in Field Guide.

Actual behavior

The pages list keeps on loading.

Steps to reproduce the behavior

1. Sign in using A8C account.
2. Go to site picker and choose Field Guide.
3. Go to Pages screen -> Published.
4. Wait to see if the published pages can be loaded. I've waited on this screen for 5 minutes, and it's still loading.

If the app is launched from Xcode, go to the Debug navigator and you can see the device/simulator's CPU usage is rocketed up to 100%.

Using FG might be an extreme case, because there are 5600+ pages in FG. However, we should allow Automatticians to use the app to view/edit FG pages. So I think it's best that we address this issue here.

Tested on [device], iOS [version], Jetpack iOS / WordPress iOS [version]

Jetpack 23.4.