Adding example error handling

Author: rhit-silkaijr

frontend/src/lib/components/left-bar/Settings.svelte

@@ -162,6 +162,7 @@
       // Only return valid info if the mod is enabled
       if(!$lockfileMods[modReference]) {
         //How to enforce error handling?
+        console.error('Tried to copy a disabled mod');
         return {
           friendlyName: '',
           modReference: '',