[BUG] Tethys install command not printing errors when only pyproject.toml available and setup.py not available

[romer8]

Describe the bug
Tethys install command not printing errors when pyproject.toml is available (and incorrect) and setup.py is not available. In addition, if there is a setup.py file, pyproject.toml takes precedence over the setup.py file.
To Reproduce
Steps to reproduce the behavior:

1. create a pyproject.toml file that is incorrect or buggy
2. Run tethys install -N
3. The app seems to be installed. but it is not

Expected behavior
The error related to the buggy pyproject.toml should be pointed, one way to see the error is to install the app with pip

Tethys Environment Information
Tethys version is the dev version