Fixed JS error that was failing the builds

app/assets/javascripts/users_select.js.coffee

@@ -2,6 +2,7 @@ class @UsersSelect
   constructor: (currentUser) ->
     @usersPath = "/autocomplete/users.json"
     @userPath = "/autocomplete/users/:id.json"
+    if currentUser?
       @currentUser = JSON.parse(currentUser)
     $('.js-user-search').each (i, dropdown) =>