Drafts: Fix logic in JS when no draft available

assets/js/form_casestudy_drafts.js

@@ -197,8 +197,11 @@ function initDrafts() {
   if (!formHasErrors) {
   // Get the previous draft, if any
     apiGetDraft()
-      .then(response => response.json())
-      .then(json => {
+      .then(response => {
+        if (response.status == 404) {
+          console.log("No draft stored on server");
+        } else if (response.ok) {
+          response.json().then(json => {
             // Handle the case where we didn't get a response
             if (!json) return
 
@@ -207,7 +210,12 @@ function initDrafts() {
             }
 
             showDraftPrompt(formSaver, json.data.form)
-      }).catch(err => {
+          });
+        } else {
+          throw new Error("Error getting draft", response)
+        }
+      })
+      .catch(err => {
         console.error(err);
       })
   }