Investigate errors in console on standalone mode

There is a bunch of 404 errors on standalone mode. You can reproduce it via index.html attached or using npm.

Comparing with the input of an online editor:

The main goal of this JIRA is to do two things:

1-) Confirm that those errors don't affect DMN editor*

2-) If the errors don't affect we should at least clean up the error logs. (we should not present any error on editor loading)