Merge pull request #1591 from RachBreeze/U4-7239

U4-7239 Now trims the parameters

src/Umbraco.Web/umbraco.presentation/helper.cs

@@ -95,6 +95,8 @@ namespace umbraco
             {
                 var attributeValueSplit = (attributeValue).Split(',');
 
+                attributeValueSplit = attributeValueSplit.Select(x => x.Trim()).ToArray();
+
                 // before proceeding, we don't want to process anything here unless each item starts/ends with a [ ]
                 // this is because the attribute value could actually just be a json array like [1,2,3] which we don't want to parse
                 //