tree dc6c17fbb70afff4ecf68813e97f1ad4cc24b9f0
parent a475144054d328b540be46812604fb3806f36ee5
author satoru <satorulogic@gmail.com> 1674179039 +0800
committer GitHub <noreply@github.com> 1674179039 -0800
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Fix misleading error message (#927)

When `rctx.which` can not find a program for the specified name, it
returns `None`.
We should not override the original `python_interpreter` in this case,
otherwise we'll see a misleading error message like `Error in fail:
python interpreter `None` not found in PATH`