fix: added safe operator for custom link

Author: aakashnepal77

app/views/casa_org/_custom_links.html.erb

@@ -26,7 +26,7 @@
             </tr>
           </thead>
           <tbody>
-            <% @custom_links.each do |custom_link| %>
+            <% @custom_links&.each do |custom_link| %>
               <% id = "custom_link-#{custom_link.id}" %>
               <tr>
                 <td scope="row" class="min-width">

app/views/layouts/_header.html.erb

@@ -72,7 +72,7 @@
                   <strong> <%= current_user.email %></strong>
                 </span>
               </li>
-              <% @custom_links.each do |custom_link| %>
+              <% @custom_links&.each do |custom_link| %>
                 <li>
                   <%= link_to custom_link.url, target: "_blank" do %>
                    <i class="lni lni-link"></i> <%= custom_link.text %>