Effects: Work around jQuery 1.6.2 returning undefined for falsy values in .data().

Author: scottgonzalez

ui/jquery.ui.effect.js

@@ -861,9 +861,19 @@ $.extend( $.effects, {
 
 	// Restores a set of previously saved properties from a data storage
 	restore: function( element, set ) {
-		for( var i=0; i < set.length; i++ ) {
+		var val, i;
+		for( i=0; i < set.length; i++ ) {
 			if ( set[ i ] !== null ) {
-				element.css( set[ i ], element.data( dataSpace + set[ i ] ) );
+				val = element.data( dataSpace + set[ i ] );
+				// support: jQuery 1.6.2
+				// http://bugs.jquery.com/ticket/9917
+				// jQuery 1.6.2 incorrectly returns undefined for any falsy value.
+				// We can't differentiate between "" and 0 here, so we just assume
+				// empty string since it's likely to be a more common value...
+				if ( val === undefined ) {
+					val = "";
+				}
+				element.css( set[ i ], val );
 			}
 		}
 	},