always show the button to delete a lot and show an error message if you try to delete a lot with devices

ereuse_devicehub/inventory/views.py

@@ -211,6 +211,13 @@ class LotDeleteView(View):
 
     def dispatch_request(self, id):
         form = LotForm(id=id)
+        if form.instance.devices:
+            msg = ("Sorry, the lot cannot be deleted because it still "
+                "has associated devices. Only empty lots can be deleted")
+            messages.error(msg)
+            next_url = url_for('inventory.devices.lotdevicelist', lot_id=id)
+            return flask.redirect(next_url)
+
         form.remove()
         next_url = url_for('inventory.devices.devicelist')
         return flask.redirect(next_url)

ereuse_devicehub/templates/inventory/device_list.html

@@ -37,7 +37,7 @@
                   <h3><a href="{{ url_for('inventory.devices.lot_edit', id=lot.id) }}">{{ lot.name }}</a></h3>
               </div>
               <div class="col">
-                  {% if lot and lot.is_temporary and not lot.devices %}
+                  {% if lot and lot.is_temporary %}
                     <a href="javascript:void()" data-bs-toggle="modal" data-bs-target="#btnRemoveLots">
                       <i class="bi bi-trash"></i>
                       Remove Lot