#19066 Empty widget layer description causes null reference exception

Work Item: 19066

--HG--
branch : 1.x

src/Orchard.Web/Modules/Orchard.Widgets/Views/WidgetLayerVisibility.cshtml

@@ -6,8 +6,12 @@
 }
 @functions {
     static string EncodeLineBreaks(string text) {
+		if (!String.IsNullOrEmpty(text)){
 			return text.Replace(Environment.NewLine, "\\\\n");
 		}
+	
+		return text;
+    }
 }
 <script type="text/javascript">
 //<![CDATA[