Change to use strict equation

browser/main/NoteList/index.js

@@ -289,7 +289,7 @@ class NoteList extends React.Component {
     let storageKey = params.storageKey
     let folderKey = params.folderKey
     let storage = data.storageMap.get(storageKey)
-    if (storage == null) return []
+    if (storage === undefined) return []
 
     let folder = _.find(storage.folders, {key: folderKey})
     if (folder === undefined) return unorderedNotes

browser/main/lib/dataApi/updateFolder.js

@@ -44,7 +44,6 @@ function updateFolder (storageKey, folderKey, input) {
       if (targetFolder == null) throw new Error('Target folder doesn\'t exist.')
       targetFolder.name = input.name
       targetFolder.color = input.color
-      // For compativility
 
       CSON.writeFileSync(path.join(storage.path, 'boostnote.json'), _.pick(storage, ['folders', 'version']))