fix: commit body should be empty by default (#2980)

Author: dangreen

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

@@ -83,4 +83,12 @@ describe('combineCommitMessage', () => {
 });
 expect(commitMessage).toBe('This is issue body message.');
 });
+
+test('should return empty message when body is empty', () => {
+setRules({});
+const commitMessage = combineCommitMessage({
+body: '',
+});
+expect(commitMessage).toBe('');
+});
 });

@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(