change is_current_user method

app/serializers/user_serializer.rb

@@ -58,7 +58,7 @@ class UserSerializer < ActiveModel::Serializer
   end
 
   def is_current_user?
-    (current_user != nil)&&(object.id == current_user.id || current_user.is_admin?)
+    (!current_user.nil?)&&(object.id == current_user.id || current_user.is_admin?)
   end
 
   attributes \