added some defenses against broken asset links, and using correct environment when creating contentful client

task: https://www.notion.so/stackbit/Sourcebit-Contentful-Sourcebit-crashes-when-Contentful-have-broken-assets-or-link-to-assets-c611ed56260242d2a456eb4142307a96

Author: smnh

.gitignore

@@ -1 +1,2 @@
-node_modules
+/node_modules
+/.idea

index.js

@@ -39,6 +39,7 @@ module.exports.options = {
 module.exports.bootstrap = async ({ getPluginContext, options, refresh, setPluginContext }) => {
     const isPreview = options.preview !== undefined ? options.preview : options.watch;
     const host = options.host || (isPreview ? 'preview.contentful.com' : undefined);
+    const environment = options.environment || 'master';
     const clientManagement = contentfulManagement.createClient({
         accessToken: options.accessToken
     });
@@ -63,7 +64,7 @@ module.exports.bootstrap = async ({ getPluginContext, options, refresh, setPlugi
                         sys: {
                             type: 'Link',
                             linkType: 'Environment',
-                            id: options.environment
+                            id: environment
                         }
                     }
                 ]
@@ -76,7 +77,8 @@ module.exports.bootstrap = async ({ getPluginContext, options, refresh, setPlugi
     const client = contentful.createClient({
         accessToken,
         host,
-        space: options.spaceId
+        space: options.spaceId,
+        environment: environment
     });
     const { assets, entries, nextSyncToken } = await syncWithRetry(client, {
         initial: true,

lib/contentful-util.js

@@ -6,6 +6,9 @@ function normalizeEntries({ contentTypes, entries, options }) {
 }
 
 function normalizeEntry({ contentTypes, entry, options }) {
+    if (!entry) {
+        return null;
+    }
     if (!entry.fields) {
         return entry;
     }
@@ -21,6 +24,9 @@ function normalizeEntry({ contentTypes, entry, options }) {
     let fields;
 
     if (isAsset) {
+        if (!entry.fields.file) {
+            return null;
+        }
         const file = Object.values(entry.fields.file)[0];
 
         fields = {