After the following change from odoo for v12+:

• De-commit-ify installation and don't fail module install on demo failure odoo/odoo#25436

If a demo data has errors exit code is 0 (success) and a WARNING level is used even if there is a traceback in the log.

For runbot it is not a problem since that runbot analyze the log using:
ERROR, TRACEBACK, WARNING...

• https://github.com/odoo/runbot/blob/4206d75256a9ca4b8d266fc56699fc2998b44ff4/runbot/models/build.py#L21-L22

For MQT is not reported since that is not analyzed the traceback and the warning are ignored.

Steps to reproduce it:

Download the following valid odoo log output:

• https://gist.github.com/moylop260/6aa35b6e96b2b459eb77294a9cc96dc7

Parser the log:
cd ~/maintainer-quality-tools/travis
python -c "from test_server import has_test_errors;print(has_test_errors('log.txt', 'openerp_test', '12.0'))"

Check the output:
----------
0

Current behavior:

The count error is 0 (not detected).

Expected behavior:

Count error should be 1 (detected) and show the traceback.