vendor/assets/javascripts/webshims/shims/form-shim-extend.js in webshims-rails-1.14.6 vs vendor/assets/javascripts/webshims/shims/form-shim-extend.js in webshims-rails-1.15.2

@@ -95,11 +95,10 @@
 	} 
 	return false;
 };
 
 var emptyJ = $([]);
-//TODO: cache + perftest
 var getGroupElements = function(elem){
 	elem = $(elem);
 	var name, form;
 	var ret = emptyJ;
 	if(elem[0].type == 'radio'){
@@ -165,10 +164,10 @@
 ;
 
 $.each({tooShort: ['minLength', -1], tooLong: ['maxLength', 1]}, function(name, props){
 	validityRules[name] = function(input, val, cache){
 		//defaultValue is not the same as dirty flag, but very similiar
-		if(cache.nodeName == 'select' || input.prop('defaultValue') == val){return false;}
+		if(!val || cache.nodeName == 'select' || input.prop('defaultValue') == val){return false;}
 
 		cacheType(cache, input[0]);
 
 		if(!lengthTypes[cache.type]){return false;}
 		var prop = input.prop(props[0]);