fixing bug with resources without any linked resources

web/app/templates/edit.html

@@ -100,7 +100,7 @@
         <select name="linked_resources" id="linked_resources" aria-label="Linked resources" class="selectpicker" data-live-search="true" multiple>
           {% for resource_dropdown in resource_dropdown %}
             {% if resource_dropdown['type'] != 'practice' %}
-              {% if resource_dropdown in links %}
+              {% if links and resource_dropdown in links %}
                 <option value="{{ resource_dropdown['id'] }}" selected>{{ resource_dropdown['name'] }}</option>
               {% else %}
                 <option value="{{ resource_dropdown['id'] }}">{{ resource_dropdown['name'] }}</option>