Handle update process exceptions for client

[alirizaadiyahsi]

If application getting error, update process message is locking "Updating dependecies".
It is better to show a message about processing that is failed. And stop the updating process.

Even though I can see updating message, I am getting 500 error on console:

This can be applied for all HTTP requests.

[okandavut]

I tried to solve this issue with simple fix #12

Now user can see errors with alert on page when updating process. Also, solution stops the update process on UI.