Hide download ZIP file button if no files are present

Author: RobinVanhove

wagtailstreamforms/templates/streamforms/index_submissions.html

@@ -89,9 +89,11 @@ <h1 class="icon icon-form">
                   <div class="col">
                       <button name="action" value="CSV" class="button bicolor icon icon-download">{% trans 'Download CSV' %}</button>
                   </div>
+                  {% if contains_files %}
                   <div class="col">
                       <button name="action" value="ZIP" class="button bicolor icon icon-download">{% trans 'Download ZIP' %}</button>
                   </div>
+                  {% endif %}
                 </div>
             </div>
         </form>

wagtailstreamforms/views/submission_list.py

@@ -128,6 +128,7 @@ def get_context_data(self, **kwargs):
                 "has_delete_permission": self.permission_helper.user_can_delete_obj(
                     self.request.user, self.object
                 ),
+                "contains_files": FormSubmissionFile.objects.filter(submission__form=self.object).count() > 0
             }
         )