improvement: add logs when a 404 error is expected (#2807)

improvement: add logs when a 404 error is expected

improvement: address code review feedback -return rejected promise

packages/netlify-cms-backend-github/src/API.js

@@ -14,7 +14,14 @@ import {
 
 const CMS_BRANCH_PREFIX = 'cms';
 
-const replace404WithEmptyArray = err => (err && err.status === 404 ? [] : Promise.reject(err));
+const replace404WithEmptyArray = err => {
+  if (err && err.status === 404) {
+    console.log('This 404 was expected and handled appropriately.');
+    return [];
+  } else {
+    return Promise.reject(err);
+  }
+};
 
 export default class API {
   constructor(config) {

packages/netlify-cms-backend-github/src/implementation.js

@@ -107,7 +107,14 @@ export default class GitHub {
         headers: { Authorization: `token ${token}` },
       })
         .then(() => true)
-        .catch(err => (err && err.status === 404 ? false : Promise.reject(err)));
+        .catch(err => {
+          if (err && err.status === 404) {
+            console.log('This 404 was expected and handled appropriately.');
+            return false;
+          } else {
+            return Promise.reject(err);
+          }
+        });
       // wait between polls
       if (!repoExists) {
         await new Promise(resolve => setTimeout(resolve, pollDelay));