fix(cz-commitlint): combine commit body with issuesBody/breakingBody when body has an empty string (#2915)

Co-authored-by: Jan Melena <[email protected]>

Author: honzamelena

@commitlint/cz-commitlint/src/SectionBody.test.ts

@@ -74,4 +74,13 @@ describe('combineCommitMessage', () => {
 		});
 		expect(commitMessage).toBe('This is issue body message.');
 	});
+
+	test('should use issueBody when body message is empty string but commit has issue note', () => {
+		setRules({});
+		const commitMessage = combineCommitMessage({
+			body: '',
+			issuesBody: 'This is issue body message.',
+		});
+		expect(commitMessage).toBe('This is issue body message.');
+	});
 });

@commitlint/cz-commitlint/src/SectionBody.ts

@@ -19,7 +19,7 @@ export function combineCommitMessage(answers: Answers): string {
 	const leadingBlankFn = getLeadingBlankFn(getRule('body', 'leading-blank'));
 	const {body, breakingBody, issuesBody} = answers;
 
-	const commitBody = body ?? breakingBody ?? issuesBody ?? '-';
+	const commitBody = body || breakingBody || issuesBody || '-';
 
 	if (commitBody) {
 		return leadingBlankFn(