CI Linter: Error: Network error: Request failed with status code 500 when the code is

Summary

CI Linter shows Error: Network error: Request failed with status code 500 when the code is on incorrect include.

Steps to reproduce

Use the CI Linter with the following content:

include:
    file: info.yml

Same happens with this example:

include:
    - file: info.yml

Example Project

It is in the Linter, not part of the code.

What is the current bug behavior?

After a few seconds we get an error with status code 500 that seems to indicate that this was a server error.

What is the expected correct behavior?

There should be some explanation that the format of the YAML file is incorrect. Indicate that the project field is required as in this example:

include:
    - file: info.yml
      project: szabgab/ci-linter-error

Alternatively, the CI system and also the linter should assume that if the project field defaults to the current project.