uv plugin fails if _get_system_python_interpreter returns None

[bepri]

Bug Description

In the base abstract definition of _get_system_python_interpreter() below, it is possible to return None.

craft-parts/craft_parts/plugins/base.py

Line 237 in 8907c07

def _get_system_python_interpreter(self) -> str | None:

However, this line below attempts to stringify the return value of _get_system_python_interpreter(), which will always break if set to None.

craft-parts/craft_parts/plugins/uv_plugin.py

Line 102 in 8907c07

f'uv venv --relocatable --allow-existing --python "{self._get_system_python_interpreter()}" "{self._get_venv_directory()}"',

To Reproduce

Override UvPlugin's _get_system_python_interpreter to return None, then attempt to build a project.

part yaml

Relevant log output

N/A

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The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-4010.

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