Issue Type: Bug
When I click "Description" on one of my pull requests, it takes a while for it to appear. Another one doesn't appear at all.

Extension version: 0.7.0
VS Code version: Code 1.34.0 (a622c65b2c713c890fcf4fbf07cf34049d5fe758, 2019-05-15T21:55:35.507Z)
OS version: Linux x64 4.15.0-50-generic
System Info
|Item|Value|
|---|---|
|CPUs|Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz (8 x 2700)|
|GPU Status|2d_canvas: enabled
checker_imaging: disabled_off
flash_3d: enabled
flash_stage3d: enabled
flash_stage3d_baseline: enabled
gpu_compositing: enabled
multiple_raster_threads: enabled_on
native_gpu_memory_buffers: disabled_software
rasterization: disabled_software
surface_synchronization: enabled_on
video_decode: unavailable_off
webgl: enabled
webgl2: enabled|
|Load (avg)|1, 1, 1|
|Memory (System)|31.12GB (18.20GB free)|
|Process Argv|--unity-launch|
|Screen Reader|no|
|VM|0%|
@erihanse For the one that doesn't appear, can you press F1 and then run Developer: Open Webview Developer Tools and see if there is anything in the console?
hey @RMacfarlane seeing this same issue but on a different os, I haven't been able to get any of the pull request descriptions to load.
Extension version: 0.7.0
OS Version: MacOS 10.14.3
VS Code version: Version 1.34.0 (1.34.0)
heres what i see in the console output:

hope this helps some.
Thanks @omawhite, that does help!
I've been getting the same error.
