assistant: Replace an `expect` with a precondition check (#12292)
This PR replaces an `expect` with a precondition check to avoid a panic
if the `LspAdapterDelegate` isn't set when invoking a slash command.
Release Notes:
- N/A
78aaa29d5bMarshall Bowers committed on 5/25/2024, 7:59:40 PM· committed by GitHubparent8450d63