Fix for #1167

src/jquery/coreTest.js

@@ -766,7 +766,7 @@ test("addClass(String)", function() {
 });
 
 test("removeClass(String) - simple", function() {
-	expect(2);
+	expect(3);
 	var div = $("div").addClass("test").removeClass("test"),
 		pass = true;
 	for ( var i = 0; i < div.size(); i++ ) {
@@ -782,6 +782,11 @@ test("removeClass(String) - simple", function() {
 	 if ( div.get(i).className.match(/test|bar|foo/) ) pass = false;
 	}
 	ok( pass, "Remove multiple classes" );
+	
+	reset();
+	var div = $("div:eq(0)").addClass("test").removeClass("");
+	ok( div.is('.test'), "Empty string passed to removeClass" );
+	
 });
 
 test("toggleClass(String)", function() {

src/jquery/jquery.js

@@ -1349,7 +1349,7 @@ jQuery.extend({
 
 		// internal only, use removeClass("class")
 		remove: function( elem, c ){
-			elem.className = c ?
+			elem.className = c != undefined ?
 				jQuery.grep( elem.className.split(/\s+/), function(cur){
 					return !jQuery.className.has( c, cur );	
 				}).join(" ") : "";