Describe the bug

When providing a file path with no mime type in a response, the effective content type at the bottom shows "false".

It should be overwritten with the route content-type if there is one (this is working), or revert to the environment content type (this is not working).

To Reproduce

Provide a file path with no mime type (see capture above).

Mockoon version:
All

OS / OS version:
All