Fix bug with ignoring whitespaces at end of expression

--HG--
branch : dev

src/Orchard.Tests.Modules/Scripting/ParserTests.cs

@@ -15,6 +15,14 @@ namespace Orchard.Tests.Modules.Scripting {
             });
         }
 
+        [Test]
+        public void ParserShouldIgnoreWhitespaces() {
+            var tree = new Parser("  true \n  ").Parse();
+            CheckTree(tree, new object[] {
+                "const", true,
+            });
+        }
+
         [Test]
         public void ParserShouldUnderstandBinaryExpressions() {
             var tree = new Parser("true+true").Parse();