Display exception message on deploy command failure

[jonbiemond]

Description

When the deploy command fails due to a missing import, output the exception message to the terminal. This way the user has the necessary information to resolve the error.

Previous output:

WARNING: Please install additional command line dependencies to use deploy command:
pip install "dlt[cli]"
We ask you to install those dependencies separately to keep our core library small and make it work everywhere.
NOTE: Please refer to our docs at 'https://dlthub.com/docs/walkthroughs/deploy-a-pipeline' for further assistance.

After fix:

ERROR: No module named 'pipdeptree'
WARNING: Please install additional command line dependencies to use deploy command:
pip install "dlt[cli]"
We ask you to install those dependencies separately to keep our core library small and make it work everywhere.
NOTE: Please refer to our docs at 'https://dlthub.com/docs/walkthroughs/deploy-a-pipeline' for further assistance.

Related Issues

Fixes (#2203)

Additional Context

[netlify]

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[sh-rp]

@jonbiemond thanks for your PR. Does installing the "cli" extra not resolve this error? In my view the error message that is there now is correct.

[jonbiemond]

@sh-rp It did not for me. You can see the details in the linked issue #2203
Once #2207 is merged that should also be resolved.

The problem with the current error message is that it hides the underlying exception. This makes it very difficult to debug and resolve.

[sh-rp]

Ok, I see. This is rather a bug in the extras (that you thankfully fixed!) than a bug here. I think if we merge your other PR, we do not need this change anymore. Alternatively you could write something like:

raise CliCommandException() from deploy_command_import_exception

And not print out this exception. Then the full trace will be visible when running the cli with the --debug flag.