fix: harden body-leading-blank implementation

Author: marionebl

source/rules/body-leading-blank.js

@@ -1,14 +1,20 @@
 export default (parsed, when) => {
+	// flunk if no body is found
+	if (!parsed.body) {
+		return [true];
+	}
+
 	const negated = when === 'never';
+
 	// get complete body split into lines
-	const lines = (parsed.raw || '').split('\n').slice(1);
-	// check if the first line of body (if any) is empty
-	const leadingBlank =
-		lines.length > 0 ?
-		lines[0].length === 0 :
-		true;
+	const lines = (parsed.raw || '').split(/\r|\n/).slice(1);
+	const [leading] = lines;
+
+	// check if the first line of body is empty
+	const succeeds = leading === '';
+
 	return [
-		negated ? !leadingBlank : leadingBlank,
+		negated ? !succeeds : succeeds,
 		[
 			'body',
 			negated ? 'may not' : 'must',

source/rules/body-leading-blank.test.js

@@ -20,7 +20,7 @@ test('with simple message should succeed for empty keyword', t => {
 	t.is(actual, expected);
 });
 
-test.failing('with simple message should succeed for "never"', t => {
+test('with simple message should succeed for "never"', t => {
 	const [actual] = bodyLeadingBlank(parsed.simple, 'never');
 	const expected = true;
 	t.is(actual, expected);