Do not accept nominations for elections before they open (#2755)

Update views.py

Author: ewdurbin

nominations/views.py

@@ -89,6 +89,11 @@ def get_form_class(self):
                 self.request, f"Nominations for {election.name} Election are closed"
             )
             raise Http404(f"Nominations for {election.name} Election are closed")
+        if not election.nominations_open:
+            messages.error(
+                self.request, f"Nominations for {election.name} Election are not open"
+            )
+            raise Http404(f"Nominations for {election.name} Election are not open")
 
         return NominationCreateForm