#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

@@ -6,7 +6,11 @@
 }
 @functions {
     static string EncodeLineBreaks(string text) {
-        return text.Replace(Environment.NewLine, "\\\\n");
+		if (!String.IsNullOrEmpty(text)){
+			return text.Replace(Environment.NewLine, "\\\\n");
+		}
+	
+		return text;
     }
 }
 <script type="text/javascript">