fix(scm): 🐛 avoid attribution leading blank line

Author: Mirrowel

src/services/commit-message/__tests__/attribution.spec.ts

@@ -40,6 +40,10 @@ describe("commit message attribution", () => {
 		)
 	})
 
+	it("returns only trimmed attribution when message is empty", () => {
+		expect(appendCommitMessageAttribution("   ", "\nAssisted-by: Zoo Code\n")).toBe("Assisted-by: Zoo Code")
+	})
+
 	it("does not duplicate an existing attribution footer", () => {
 		const message = "feat(scm): generate commits\n\nAssisted-by: Zoo Code"
 

src/services/commit-message/attribution.ts

@@ -64,6 +64,10 @@ export function appendCommitMessageAttribution(message: string, attribution: str
 		return cleanedMessage
 	}
 
+	if (!cleanedMessage) {
+		return cleanedAttribution
+	}
+
 	if (cleanedMessage.endsWith(cleanedAttribution)) {
 		return cleanedMessage
 	}