Passing the option --build-id-pat="" to conda build does not work

[travishathaway]

Checklist

• I added a descriptive title
• I searched open reports and couldn't find a duplicate

What happened?

In our documentation for the deprecated --no-build-id option, it says that this should be done instead by using --build-id-pat="". This currently does not work and when inspecting the code, it's easy to see why:

conda-build/conda_build/config.py

Line 632 in ccc3e81

old_build_id_t = self.build_id_pat if self.build_id_pat else "{n}-{v}_{t}"

and

conda-build/conda_build/config.py

Line 661 in ccc3e81

build_id = self.build_id_pat if self.build_id_pat else "{n}-{v}_{t}"

In the above examples, which represent everywhere in the code this configuration option is used, passing and empty string "" would evaluate to false and the trigger the usage of "{n}-{v}_{t}" instead.

What should happen?

• Fix this bug and add new test cases that cover it

Additional Context

This is was initially reported in response to concerns brought up in this issue:

• Build error related to os.getcwd() on linux. Only works with --no-build-id conda-package-handling#205

[github-actions]

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