return 422 when submit archived submission

app/controllers/submit_form_controller.rb

@@ -42,6 +42,12 @@ class SubmitFormController < ApplicationController
       return render json: { error: 'Form has been completed already.' }, status: :unprocessable_entity
     end
 
+    if submitter.template.deleted_at? || submitter.submission.deleted_at?
+      Rollbar.info("Archived template: #{submitter.template.id}") if defined?(Rollbar)
+
+      return render json: { error: 'Form has been archived.' }, status: :unprocessable_entity
+    end
+
     Submitters::SubmitValues.call(submitter, params, request)
 
     head :ok

app/javascript/submission_form/form.vue

@@ -749,7 +749,7 @@ export default {
             }
           }
         }).catch(error => {
-          alert(error)
+          console.error(error)
         }).finally(() => {
           this.isSubmitting = false
         })