Stashes with a single untracked file created with "stash push" aren't shown in the GitLens explorer

[alextegelid]

This might affect multiple untracked files aswell.

• GitLens Version: 8.1.1
• VSCode Version: Version 1.21.1 (1.21.1)
• OS Version: macOS 10.12.6 (16G1314)

Steps to Reproduce

1. Create a stash with an untracked file using git stash push.
   Example: git stash push -u -m 'test' -- /path/to/untracked/file.txt

Expected behavior
The stash should show up in the "Stashes" section of the gitExplorer (where it says No stashed changes if nothing is stashed).

Actual behaviour
The text No stashed changes disappears but the stash isn't shown.

[github-actions]

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