Fix segfault in "install:cli" when app is not yet installed (#9427)

Release Notes:

- Fixed a panic running `cli: Install` or `cli: Register Zed Scheme`
before installing the app.
f1d98dc748Conrad Irwin committed on 3/16/2024, 3:16:09 AM· committed by GitHubparentc2b42e2
1 file changedLine totals unavailable