Opening PR without devcontainer.json: repository 'undefined' does not exist

[chrmarti]

Issue Type: Bug

#2638

With chrmarti/vscode-regex#41:

Extension version: 0.109.0
VS Code version: Code - Insiders 1.44.0-insider (d7d1147d6b764a48b789000c03088ee9afabcd8a, 2020-03-31T08:22:34.682Z)
OS version: Darwin x64 19.2.0
Remote OS version: Linux x64 4.19.76-linuxkit
Fetching remote diagnostics for 'Dev Container' failed.

System Info

Item	Value
CPUs	Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz (16 x 2400)
GPU Status	2d_canvas: enabled flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled metal: disabled_off multiple_raster_threads: enabled_on oop_rasterization: disabled_off protected_video_decode: unavailable_off rasterization: enabled skia_renderer: disabled_off_ok video_decode: enabled viz_display_compositor: enabled_on viz_hit_test_surface_layer: disabled_off_ok webgl: enabled webgl2: enabled
Load (avg)	3, 3, 3
Memory (System)	32.00GB (0.02GB free)
Process Argv	-psn_0_3851180
Screen Reader	no
VM	22%

Item	Value
Remote	Container vscode-remote-containers_devc…
OS	Linux x64 4.19.76-linuxkit
CPUs	Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz (4 x 2400)
Memory (System)	7.78GB (0.73GB free)
VM	0%

Fetching remote diagnostics for 'Dev Container' failed.

[egamma]

This is a PR from an unknown repository since the account of the creator has been deleted

Protecting for this case.