Fixes #2923 adds empty string protection

CHANGELOG.md

@@ -12,6 +12,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 
 ### Fixed
 
+- Fixes [#2923](https://github.com/gitkraken/vscode-gitlens/issues/2923) - TypeError: Only absolute URLs are supported
 - Fixes [#2926](https://github.com/gitkraken/vscode-gitlens/issues/2926) - "Open File at Revision" has incorrect editor label if revision contains path separator
 - Fixes [#2952](https://github.com/gitkraken/vscode-gitlens/issues/2952) - Inline blame not working because of missing ignoreRevsFile
 - Fixes [#2814](https://github.com/gitkraken/vscode-gitlens/issues/2814) - GitLens Inspect: "Files Changed" not following when switching between commits in File History

src/ai/openaiProvider.ts

@@ -20,7 +20,7 @@ export class OpenAIProvider implements AIProvider {
 	dispose() {}
 
 	private get url(): string {
-		return configuration.get('ai.experimental.openai.url') ?? 'https://api.openai.com/v1/chat/completions';
+		return configuration.get('ai.experimental.openai.url') || 'https://api.openai.com/v1/chat/completions';
 	}
 
 	async generateCommitMessage(diff: string, options?: { context?: string }): Promise<string | undefined> {