properly handle attrs with zero length values

Author: leeoniya

src/index.ts

@@ -460,7 +460,7 @@ export class HTMLElement extends Node {
 			return this._rawAttrs;
 		const attrs = {} as RawAttributes;
 		if (this.rawAttrs) {
-			const re = /\b([a-z][a-z0-9\-]*)(?:\s*=\s*(?:"([^"]+)"|'([^']+)'|(\S+)))?/ig;
+			const re = /\b([a-z][a-z0-9\-]*)(?:\s*=\s*(?:"([^"]*)"|'([^']*)'|(\S+)))?/ig;
 			let match: RegExpExecArray;
 			while (match = re.exec(this.rawAttrs)) {
 				attrs[match[1]] = match[2] || match[3] || match[4] || "";

test/html.js

@@ -264,12 +264,13 @@ describe('HTML Parser', function () {
 
 		describe('#attributes', function () {
 			it('should return attributes of the element', function () {
-				var root = parseHTML('<p a=12 data-id="!$$&amp;" yAz=\'1\' disabled></p>');
+				var root = parseHTML('<p a=12 data-id="!$$&amp;" yAz=\'1\' class="" disabled></p>');
 				root.firstChild.attributes.should.eql({
 					'a': '12',
 					'data-id': '!$$&',
 					'yAz': '1',
-					'disabled': ''
+					'disabled': '',
+					'class': ''
 				});
 			});
 		});